Alan Cohen’s essay treats age-related disease and maximum lifespan as separate goals

Alan Cohen’s essay treats age-related disease and maximum lifespan as separate goals

On October 20, aging researcher Alan Cohen published an essay on the goals of medicine as people age. He wants people to live longer without chronic disease or loss of independence and proposes considering increases in maximum lifespan separately. On October 23, biogerontologist Aubrey de Grey described the essay as a critique of life extension and wrote that he had responded with six comments.

Cohen begins with a question from biologist Steve Austad: if medicine could prevent cancer, heart disease, diabetes, and Alzheimer’s disease together, people would gain more years free of pain, memory loss, and dependence on others. He endorses that goal. He treats maximum human lifespan as a separate question:

“Extending maximum human lifespan is a separate question.”

This distinction frames a debate within aging research. In a recent article in GeroScience, the authors propose assessing future interventions both by how well they preserve health and by whether they help people stay alive, with the individual’s wishes guiding the choice. Cohen’s goals remain health and independence, while he regards extending maximum lifespan as a matter of values.

Cohen describes his preferred trajectory as one in which people remain healthy and independent for most of their lives, with chronic pain, severe dementia, and loss of function compressed into the final period. He treats this scenario separately from an increase in maximum lifespan.

Cohen explains the reasoning behind his position by comparing an individual life to a whirlpool in a stream:

“Our lives, all life, are like whirlpools in a stream.”

A whirlpool forms from moving water, holds its shape for a time, and disappears while the stream continues. Cohen uses this image to consider the individual as part of ecological, social, and psychological systems. He suggests that radically longer lives could increase pressure on resources, intensify disputes over access to therapies, lead to restrictions on reproduction, and give influential people more time to remain in power.

Cohen describes the debate over the goals of aging research as a matter of values and writes that a finite lifespan can be part of a meaningful life. In the October debates, de Grey defined success as longevity escape velocity: age-related damage must be repaired faster than it accumulates so that biological age, an assessment of the body’s condition based on signs of aging, remains stable.