It will take decades for the changes in length of life to play out to allow assessment of their benefits and harms. By then it may be too late to reverse the damage. One likelihood, even in just a few years, is that older people who stay longer in the work force, as many are now forced to do, will close out opportunities for younger workers coming in.
And exactly what are the potential social benefits? Is there any evidence that more old people will make special contributions now lacking with an average life expectancy close to 80? I am flattered, at my age, by the commonplace that the years bring us wisdom — but I have not noticed much of it in myself or my peers. If we weren’t especially wise earlier in life, we are not likely to be that way later.
I have often been struck, at funerals of the elderly, of the common phrase that while the deceased will be missed, he or she led a “full life.” Adding years to a life doesn’t necessarily make it any fuller.
We may properly hope that scientific advances help ensure, with ever greater reliability, that young people manage to become old people. We are not, however, obliged to help the old become indefinitely older. Indeed, our duty may be just the reverse: to let death have its day.