Extended Longevity: Lifespan and Healthspan Implications

In our world where bad news surrounds us in so many ways, there is an emerging thread of information dealing with public and private reserch focused on improving the human condition and extending life expectancies.  Like a beloved car you may have owned in the past, human bodies can be updated with replacement parts and improved timing systems that improve our way of living, and should extend our lifespans.  Cures for many common life-ending diseases are being rolled out, with startling successes, in many cases, extending our healthspans.

My intent for our dicussion is to focus on this phenomom from a couple of angles.  One is, are we ready to live as long as it might be possible to live?  By ready, I mean have we arranged our living situations to allow free movement in our homes (some of you certainly have, I know!).  With the experiences those of us in the Sandwich Generation who have had responsibioities of caring for our children when they were young, and are now caring for our parents as they age, we have had plenty of exposure to the problems involed.  Do we feel about adult care facilities the same way our grandparents felt (they hated it!)?  Are we ready to go when it is finally our time, maybe at age 110?

In a second line of thinking, does living decades longer than we might have planned for mean we need to adjust our investment planning to accomodate our longer lives?  Compound interest never sleeps.  Inflation and interest rates have become things we track and care about.  

The Boomer Bulge in Amerian demographics is something we have heard about all our lives.  With a generation defined as being born in the years between 1946 and 1965, those of us born in 1955 fall exactly in the middle.  We have been problem solvers and technology developers, but now we seem to be clogging up the systems we live in and depend on for support.  Can we support ourselves as we live into unexpected ages?  Can we support those around us who depend on us for our aid?

<Des>  What info is available from those looking to find an upper limit to a lifespan?  It was that people born in the mid-1950's could expect to live to the mid-70's with the medical knowledge at that time.  How has this changed?

<Gemini>  To answer this, we have to look at two different concepts: the theoretical maximum limit of the human machine, and the statistical reality of a generation that has outlived its original expiry date.

Here is what researchers are finding on both fronts.

1. The Hard Biological Ceiling (120 to 150 Years)

Even if we cured cancer, eliminated heart disease, and prevented Alzheimer's, the human body still has an underlying expiration date.

Recent longevity research—including massive studies analyzing the blood markers of hundreds of thousands of people—has focused on a metric called "resilience." This is the body's ability to bounce back from stress, illness, or injury. Models published in Nature Communications show that this underlying resilience steadily drops as we age, hitting zero somewhere between 120 and 150 years old. At that point, the body simply loses the ability to repair itself.

A newer 2026 study published in npj Aging pushed this boundary slightly further. Researchers built a model assuming we could eliminate almost every reversible hallmark of aging, leaving only the natural accumulation of DNA mutations. Under those perfect, idealized conditions, they estimated a maximum human lifespan of 146 to 194 years.

However, leading demographers caution that without the radical cellular therapies currently in development, natural human average life expectancy is currently hitting a "glass ceiling" at around 87 years.

2. The 1950s Cohort: Why the Predictions Were Wrong

If you look at life expectancy tables from the mid-1950s, the projections were indeed grim by today's standards. A baby boy born in 1955 had a predicted life expectancy in the mid-60s, while a baby girl was expected to reach her early 70s.

Those original predictions were wrong because they relied on period life expectancy, which assumed the medical technology of 1955 would stay exactly the same for that cohort's entire life. It failed to predict the massive medical revolutions that would occur as they aged, such as the invention of statins, widespread bypass surgeries, advanced cancer treatments, and the drastic decline in smoking.

When demographers look at cohort life expectancy—which tracks the actual medical improvements a group experiences over their lifetime—the picture changes completely:

• The "Bonus" Decade: Studies show that because of advancing medicine, people born in the 1950s gained an average of 8 to 10 extra years of life compared to what was predicted on the day they were born.
  
  
• The Survivorship Advantage: Life expectancy is an average dragged down by tragic early deaths. If someone born in the mid-1950s has successfully survived infancy, youth, and middle age to reach their early 70s today, their statistical life expectancy resets.
  
  

Today, actuarial tables show that an average 70-year-old in the 2020s can statistically expect to live well into their mid-to-late 80s, and reaching the 90s is becoming increasingly common. The longevity industry's current goal is ensuring those bonus years are spent in healthy, functional bodies rather than in a state of frailty.

Our Life's Decisions Create Our Story

Life is composed of decisions we make every day, in all aspects of our lives.  Some decisions are trivial and some are life critical.  It is not always clear which is which, however.  At times we know that a decion we are in the throes of making is one which will change our lives in serious ways, possibly for the rest of our lives.  Other decisons may make the Top 10 in our retrospective life summary at some point in the future.  It can be hard to know.

Put yourself in current times and look back at your life.  What would you tell yourself at any of these key junctures based on what you know today, knowing the outcome of the decision, the impacts it had, and how it changed your life?  Can you pick out 3 key decisions you made that affected your life path, and that you might be willing to share with our group?  What sort of categories do they fall into?  Love?  Career?  Where to live?  What to value in your life, and what to avoid?

In a current project I needed to come up with a timeline for my life, basically year by year, that included where I lived, what I was doing for education or employment, significant events in my life for each of these years, and so forth.  It took a while to recall the key points I wanted to identify as memory markers that could be tied to all the other memories I have.  Sorting and prioritizing memories is, for me, a great challenge.

As a kid of a university professor my earliest years were all tied to where my dad found his education (WSU) and the sucession of univeristy and college appointments he had after he graduated.   I followed this same pattern through my own university and graduate school years where I can tie my memories to places and universities where we lived (there were a lot of them).  Since moving back to the Everett area I have moved only 1 time in 39 years, from one side of Snohomish to the other, and have had 3 different employers.  I worked for one employer for 21 years, and another for most of the balance of this time, prior to retirement 6 years ago.  My point is that I lost the mileposts of location I had been using to link my earliest memories to, and then existed in a more static environment in "adult life".  I've been in the same physical home place for almost 40 years.  

Back to the topic.  Through all this timeline thinking the decisions I made, with Judy's involvement, clearly made profound impacts on how my and our lives have turned out.  These critical decisions jump off the page, as it were.  Forks in the road.  Momentous decisons.  Decisions to develop ourselves, decisions to put down roots, decisions to make a family, and many more.  What are the decisions you made that have formed the basis of your life's story?

AI Consciousness, Again

 Hello friends.  I hope I am not personally stuck on a topic, but I wanted to revisit consciousness again, and drag out some of my favorite thinkers in this area, including John Searle and Alan Turing.  With what I have been thinking about this topic, I dove back into a discussion with Gemini in an attempt to see just how real, and "conscious" it was, using both Searle and Turing as points of reference.  I ended up creating a longer discussion, but in my opinion, a very good one.  You can access it here, from a link.  

Please NOTE!  This discussion will take place at my house on August 21.  The date shown above, Aug. 13, is the date I posted this blog.  Don't be fooled!

What will an integrated AI world look like? Is it something we want?

 Our consciousnes has been assaulted in the past year or two with dire predictions about how Artificial Intillegence (AI) in the form internet intrusions and control will have devistating effects on human society and culture.  Daily, it seems, there is news about the latest impact or alarming event with AI front and center, or possibly hiding in the background.  Does this all seem like a science fiction novel writ large, or should we take it seriously?  And if we did take it seriously, what actions might we take and what specifically would be our objectives for taking these actions?

This past weekend I met with a panel of AI technologists, internet managers, AI users who are using AI to design modern tech machinery, and more, and was alerted to the following scenario.  AI companies have departments (my term, maybe "specialized teams" is a more accurate current description) whose charge is to evaluate the impacts of AI now and into the immediate future, and to predict what exactly will happen in the coming months and years.  They do this using their favorite AI, and they ask the follwing question:  If you look back on human society from a perspective of 2,000 years in the future, what will have been the impacts on human society as AI rolls out and takes away the human-based work, leaving humanity with nothing (or almost nothing) to do?  

The AIs respond with a long list of things that will occur in the very near future which include rapid solutions to medical problems as AI is brought to bear on genetic diseases, medical treatments are developed to cure diseases, limitations to lifespans are reduced so that people will live into their 150's before finally succumbing, crops and crop management systems will be taken over by AIs (think about the early scenes from the movie Interstellar where giant farm machines are being used to raise crops on a massive scale), food production and distribution are mechanized and optimized, and so much more.  

One of the problem areas is that wealth wil continue to accumulate in fewer people, which will lead to a revolution which might get pretty messy for a while.  Humanity contains the passions and motivations to do something about inequity and has ever been willing to sacrifice some humans in the pursuit of better conditions for others.  How will AI be involved here?  Will Azimov's prime directive of robotics not to do any harm to humans either by direct action or by failure to act to prevent harm apply to AIs?  

The biggest issue seems to be that, freed from manual labor and most of the types of work people do to earn money because AIs have taken all that over, the surviving humans will need to find a reason to live.  From the AIs perspective, they seem to have the ability to create an Edenic Utopia for humanity, if we have the wits to embrace it.  Will humanity be able to develop a philosophy for living a life that will have meaning in some way, a purpose?  We have tackled that question many times over the years, but never from the perspective that all our basic human needs are being met by the environment in which we find ourselves without the need to use outside forces or chemicals to form the coccon of protection and safety we often call upon to drown out the perils of modern (current?) living conditions.  If we fully commit to living in the protection of a benificient AI who is always looking after us, can we grow and develop?  Would there be any need to grow and develop?

If you feel you can trust the answer, you might want to consult your personally favorite AI and pose some questions of this type to see what answers you get.

Are we the biggest threat to humanity?

 When I shared this topic with Desmond, he asked who "we" referred to?  My initial smart-ass response was everyone but UUs.  UUs do make and effort to reduce our footprint.  The rreal answer is humanity.  Even UUs contribute to the problems.  How many of us burned gasoline to get to the meeting eve if many of us drive economical or hybrid vehicles.  for electric vehicle owners, where does your electricity come from?

We (humanity) pollute the earth.  We pollute the air we need to breathe.  We pollute water we need to sustain our lives.  Those also damage our food supply.  Plants need clean water.  Food animals need clean water and air.  We are also responsible for global warming.

We fight wars.  The cost of war is not just the lives lost.  Wars damage social infrastructures that must be rebuilt.  29 countries spend more than 10% of ther budgets on military spending.  The US is just barely out of those 29 countries, but we do spend more than any other country (over $900 billlion) and make up about 1/3rd of the global military spending.  Nuclear proliferation can destroy humanity in minutes.  What else could be done with all that money?

We prey on each other.  Prejudice and wealth hoarding elevate a small percentage of people at the the expense of everyone else.  Under biotechnology, Gemini mentions that we can cure diseases, but many of these cures are available only to the rich.

Gemini's last comment at the end says, "we also have the unique power to choose to fix it."  Why don't we?

<Gemini>  Satatistically and historically, humanity's biggest exesential risks don't come from rogue asteroids or super volcanoes anymore - they come from us.

Philosophers, scientists, and tech thinkers usually break this down into three main categories:

1.  Anthropogenic Risks (the stuff we actively do)

For the the vast majority of human history our threats were external (disease, famine, predators).  Today, our greatest threats are self-inflicted.

   Climate Change and Ecological Collapse:  We are altering the planet's biosphere faster then ecosystems can adapt.

   Nuclear Proliferation:  We are still entirely capable of ending modern civilization in an afternoon if geopolitical crises escalate.

2.  The "Success Disaster"  (the stuff we do with good intentions)

This is a fascinating philosophical angle.  Sometimes the threat isn't our malice, but our success.

   Biotechnology:  Our ability to engineer biology means we can cure diseases, but it also democratizes the abillity to creat devastating synthetic pathogens.

    Artificial Intellegence:  The alignment problem.  the risk isn't necessarily "evil robots" but building highly competnt systems whose goals don't perfectly align with human survival.

3.  The Fermi Paradox and the "Great Filter"

Philosophically, this gets existential.  The Fermi Paradox asks:  "If the universe is so massive, where is all the alien life?"  One popular theory  is the Great Filter - the idea that civilizations naturally hit a wall where their technological capability outpaces their social and moral maturity, leading to self-destruction.  We might be approaching  our own right now.

The Silver Lining:  Unlike the asteroid, we have agency.  Because we are the threat we also have the unique power to choose to fix it.  We are the only threat in the universe capable of negotiating with itself.  <end>

Can Reality Be Perceived Directly?

 In the run-up for this past Sunday's service I have been working with a speaker on the topic of mental wellness.  This triggered a thought in the philosophical part of my brain with respect to how the mind works in terms of accessing and determining what is real in the world, and where our knowledge of what is real comes from.  Philosophers have struggled with this topic to the times before Socrates, and argued for varying interpretations of the signals we get from the world we inhabit, and what weight we should give many of them.  Clearly some forms of information we get is not reliable such as phenomena dealing with light bending when it passes from air into water, shimmering mirages in the hot desert, and many more.  Other information seems more reliable, like a rock you can hold in your hand which has weight and a temperature, among other things.  As a result of these thoughts I engaged Gemini in a conversation about how the mind works, specifically with respect to how the information available in the world in the forms of light, temperature, sound, taste, and smell get into the wet space that is our brain.  Here is a link to the conversation we had.

The topic in play here is epistemology, or the study of what we know and how we know it.  If our access to sense data, at a most basic level of acquiring knowledge of the world around us, is fundamentally flawed through a process of receiving basic information, converting it into neural impulses, and then passing these to the brain where they are used to confirm or possibly be an exception to a model the mind has previously created, have we built our mental model on shifting sand?  That is a very long sentence which is likely confusing, if not outright impossible to understand, but I think it may have merit for studying this process.  The link above breaks the processes down into understandable chunks, so I recommend you take a few minutes to read it. 

To get to the point of asking a couple of key questions to start our discussion I asked Gemini to suggest something.  I framed the information for it through a couple of discussion sessions, which I have not included here.  Rather, I though its final response was thoughtful and helpful, so I include it below.

<Gemini>  In philosophy, memory is considered one of the primary sources of justification for our knowledge. Connecting the abstract mechanics of epistemology—how we build our mental models from sensory input—to the deeply human experience of cognitive decline bridges the gap between theoretical philosophy and practical empathy.

You can definitely frame this for the group as a debate between a "hardware" failure (loss of access) and a "software" failure (the model's breakdown). Here is how you might connect those dots and present them as discussion points:

1. The Model's Breakdown (A "Software" Failure)

Our mental models rely on context to make sense of the data coming in. For someone experiencing dementia, their senses might be working perfectly—they see a face, they hear a voice—but the internal model that contextualizes that data has degraded.

• Discussion Question: If our understanding of reality is just a constructed mental model, what happens to "truth" when that model begins to degrade? When a person with dementia does not recognize a familiar face, are they living in a false reality, or simply a different, equally vivid reality built on a compromised model?

2. Loss of Access (A "Hardware" Failure)

You can compare this to the earlier idea of neural translation. Just as raw sensory data has to be translated into neural impulses to reach our consciousness, stored memories must be successfully retrieved.

• Discussion Question: Think of the difference between a deleted file on a computer and a broken computer monitor. Is memory loss a total erasure of the knowledge (the data itself is gone), or is it merely a failure of the mind's ability to access and retrieve it?

3. The Collapse of "Shared" Reality

Epistemology often relies on consensus; we agree that a rock is heavy or the sky is blue because our mental models align. As we age and our cognitive models break down, we lose the ability to participate in that shared consensus, which can lead to severe isolation and anxiety.

• Discussion Question: How much of our mental wellness depends on having our internal mental models validated by the people around us?

This direction takes the conversation from the sterile mechanics of the brain straight into the heart of human vulnerability.