I look at my being alive as one instance of the larger wonder of organic life. Over millions of years, cells and plants and animals have come to life anew and functioned for as long as needed to create offspring. Gradually, features that give the individual and thus the species the best odds for continuity are honed. I am part of that long sequence and I see my being alive now, my body, my membership in a society and culture, and my eventual death in that context.
But what about my aging—senescence? The wrinkling and weakening, the deteriorating of knees, hearing, muscle, brain, and heart? Where do such changes fit in? Perhaps because I’m going through them at age 73, it’s sometimes difficult not to see such decline as pointless. The certainty of death is hard enough; aging as a prelude can feel demeaning.
I think this way even though I know that different species live and die in many different ways. Some plants live one year, others come back every season. Bacteria clone themselves and don’t die from age but from hostile organisms and conditions in their environment. Seabirds age very slowly; as long as they can fly, they can usually avoid predators. Lobsters don’t age; they can continue to grow and remain fertile for 45 years or more in the wild, dying only when they can no longer molt and grow a larger shell.
The causes of aging are complex and difficult to study definitively. Wikipedia’s “Senescence” introduces the range of theories and uncertainties. The approach that catches my attention the most is the study of aging in terms of natural selection and evolution. Here are three highlights that have struck me.
One is that certain harmful genetic mutations switch on later in life after an organism’s reproductive period has ended—many cancers, for example, in humans. Because they don’t impact the number or health of the offspring, such genes do no harm to the persistence of the species and so they are unlikely to be lost over the generations. The diseases of the elderly get passed along by the young.
Even more unfortunately, some mechanisms in our bodies boost our health when we’re young and then come back to bite us when we get older. Digesting calcium, for instance, builds strong bones early on but helps clog and stiffen arteries decades later. As long as such a function improves our fitness to make and raise babies, whatever damage it does later on doesn’t matter much in the very long run.
A third way in which selection seems indifferent to the pains of aging is partly statistical: even if natural selection did reduce the ravages of aging and prolong the fertile period, such organisms would nevertheless decline in numbers from accidents or predators as the years pass. The body invests its resources where they are the most effective for the future, in youth and early reproduction, not in a comfortable old age.
In these ways and others, aging apparently takes its cue from the importance of reproduction and from the danger of predators and other external forces. For primates, including me, we reproduce early because the big cats—leopards, jaguars, cougars, tigers—stalked us for millions of years in the forests and grass lands. And for most other species as well, reproduction early in the parents’ lives is the safest bet for species continuity. Still, the exceptions are fascinating. Lobsters in their suit of armor run little risk from ancient predators, so they can reproduce throughout their lives without ever aging into genetic irrelevance.
So. Does my basic and imperfect understanding of all this alter how I experience my weakening muscles, my declining sexuality, my distracted thinking, my reduced sense of taste? To an extent, yes it does. It’s the sense of pointlessness, of feeling disposed of by nature despite all its power to change things, that makes aging harder to bear. Knowing that the decline has its own place, though a melancholy one, in the organic pragmatism that brought me to being in the first place in some consolation.