The environment may be part of the healthspan equation

We tend to think of health as something contained within the individual. Blood pressure is ours. Muscle mass is ours. Hearing is ours. Cognitive function is ours. We exercise, eat, sleep, take medications, and undergo treatment in an effort to influence those things.

But independence is partly relational. A person with limited mobility in a one-story home may function very differently from someone with the same mobility living at the top of a staircase. Mild hearing loss may have a relatively small effect in one setting and become socially exhausting in another. A person who no longer shops easily may remain fully capable of choosing food and managing meals if delivery and technology are available.

Without those supports, the same physical limitation can result in dependence on another person.

That means we may be measuring only part of the problem when we ask what an individual can do. Perhaps we should also ask what the environment allows that person to continue doing.

Adaptation does not necessarily mean recovery

Healthy aging discussions understandably emphasize preventing decline and restoring function where possible. Strength can sometimes be rebuilt. Vision can sometimes be corrected. Hearing may be improved. Rehabilitation can restore abilities after illness or injury.

But we will not always be able to restore every lost capability. Adaptability asks a different question: if the original ability cannot be fully restored, can its function be preserved another way?

Someone who can no longer climb stairs may not need to regain that ability if daily life can be reorganized onto one level. Someone who struggles with small print may remain independent if technology can enlarge text or read it aloud. A person who cannot safely drive may still retain considerable freedom if reliable alternatives make transportation almost effortless.

The goal is not to pretend that nothing has changed. The goal is to keep that change from unnecessarily shrinking the person’s life.

Perhaps capability has more than one layer

The more I think about capability, the less useful it seems to treat every ability as equally important to every person. Certain abilities matter to almost everyone. Being able to move safely, think clearly enough to make decisions, communicate, manage basic daily activities, and navigate one’s environment are foundational.

Beyond those, the weighting becomes personal. For one person, continuing to drive may be essential. For another, it may hardly matter. Someone may consider travel central to a good life. Someone else may care much more about gardening, cooking, singing, running a business, caring for grandchildren, or continuing to live in a particular home.

A healthspan model that treats every capability as equally important to every person may therefore miss something fundamental. A person is not simply a collection of functions. Some functions support the life that person most wants to continue living.



Adaptability may be the bridge

This makes me wonder whether a useful way of thinking about independence has at least three elements. The first is core capability: the physical, cognitive, sensory, and practical abilities that support basic independence. The second is personally valued capability: the abilities that allow a particular person to continue doing the things that give his or her life its shape. The third is adaptability: how well independence can be preserved when either of those capabilities changes.

Sometimes adaptation comes from the individual: learning a new skill, changing a routine, accepting a device, rebuilding strength, or finding another way to accomplish something. Sometimes it comes from outside: better transportation, accessible housing, assistive technology, social support, safer community design, or services that remove an unnecessary barrier. Most often, it is probably some combination of the two.

This changes how we think about prevention

Prevention remains essential. It is obviously better to prevent a disabling stroke than to redesign life around one. It is better to prevent a serious fall than to adapt afterward. It is better to preserve strength, hearing, vision, and cognitive function for as long as possible.

But a serious model of healthy aging may also need to acknowledge that change is inevitable. If we live long enough, something will eventually become harder. The important question may be whether that first change remains relatively contained or whether it starts a cascade.

Reduced mobility, for example, might lead to less activity. Less activity may contribute to further loss of strength and confidence. Going out becomes more difficult. Social contact decreases. The person’s world becomes smaller. The original problem may have been mobility, but the eventual consequence may be much broader.

Adaptation may therefore matter not only because it compensates for a lost ability, but because it can interrupt that chain before one loss turns into several.

Independence may be more flexible than we assume

We often talk about independence as though it is something a person either has or loses. I am beginning to think that is too crude. Independence can sometimes be preserved through substitution, compensation, redesign, and support. A person can lose one ability without necessarily losing control over the life that depended on it.

That does not make the loss unimportant. It changes the question from whether decline occurred to how much of its effect can be prevented from spreading. Not every loss has to become a loss of agency.

Why wait until something is lost?

This raises another question I had not considered when I first began thinking about capability span: when should we start having these conversations? Much of the support surrounding aging is understandably triggered by a problem. A fall occurs. Driving becomes unsafe. A spouse can no longer provide care. The stairs suddenly become difficult. Someone is discharged from a hospital weaker than before.

At that point, physicians, social workers, occupational therapists, care managers, family members, and community organizations may all become involved. But perhaps the conversation should begin much earlier, while the person is still functioning well and still has many choices.

We routinely plan financially for retirement years before we stop working. We prepare wills and advance directives before we expect to need them. Yet many of us give relatively little thought to how the structure of our everyday lives might affect our independence twenty years from now.

Maybe there is room for something we might call independence planning or capability planning. The conversation would not begin with, “What help do you need?” It might begin with, “What parts of your life would you most want to preserve?” Then we could ask what abilities that life depends on, where the vulnerable points are, what would happen if driving, hearing, mobility, or stamina changed, whether the home is adaptable, whether transportation alternatives exist, whether technology is a realistic substitute for some activities, and who would notice an early decline before it became a crisis.

The point is not to predict every loss. It is to make sure that when change eventually arrives, we have more than one way forward.

A different question for healthspan

My earlier article left me asking whether we need a second longevity map, one that considers what threatens our ability to remain capable rather than only what threatens survival. This discussion adds another dimension. Maybe measuring capability is still not enough. We may also need to understand how vulnerable that capability is to change, how easily independence can be preserved when something no longer works the way it once did, and whether we should prepare for those transitions before they occur.

That could mean asking: What happens if I can no longer drive? What happens if stairs become difficult? What happens if hearing deteriorates? What happens if recovery from an illness takes much longer than expected? Which parts of my current life would become fragile, and which could be adapted fairly easily?

Those questions are not pessimistic. They may be one of the more practical ways to protect independence before it is threatened. Healthy aging may therefore be about more than preserving the body we have now. It may also be about creating enough flexibility in ourselves and in our surroundings that when life changes, we can change with it without unnecessarily surrendering control.

Capability tells us what we can do today. Adaptability may help determine how much of our life remains ours tomorrow.



A Note from Marsha

This blog post article grows out of the question I explored in Are We Measuring Healthspan the Wrong Way? In that earlier post, I asked whether we focus too narrowly on disease and survival when we think about aging well.

Here, I am taking the next step. I do not think preserving independence means preventing every change that comes with age. That does not strike me as realistic. What interests me more is whether we can prevent one change from unnecessarily taking other parts of life with it.

If there is another way to get where I want to go, accomplish what I want to accomplish, or remain involved in something that matters to me, then I still have choices. And preserving choices may be one of the most important parts of preserving independence.

This was the starting point for this blog post article featured here:

Are We Measuring Healthspan the Wrong Way?

The Wellness Center For Healthy Living