Joe Biden’s race against time

This isn’t just about Biden’s age—it’s about ours, and the tension between a vast cohort of Baby Boomers who have trained themselves to believe they’re only as old as they feel and a couple of impatient generations lined up behind them, wondering when they’re going to get a chance to take over. And yet it’s about far more than simply a number next to a name. Our sense of who is old in this primary has become entwined with our appetite for bold and new ideas. All three of the top-polling Democrats, after all, are in their 70s, but it’s Biden, the centrist who advocates for a return to a pre-Trump time, who is getting dinged the most for his advanced age—not Elizabeth Warren, who wants “big, structural change” and turned 70 in June. Up until this week when he had to have two heart stents implanted, neither was Bernie Sanders, who continues to call for his “revolution” and is in fact the oldest of the lot.

But there is an entire cohort of Biden supporters for whom his age—actual and perceived—is the very thing that recommends him. After the tumult of the Trump years, these voters crave the experience and order and stability Biden promises. For them, Biden is the beneficiary of shifting social and cultural notions that make it harder to pinpoint what it actually means to be old. Federal law protects workers from age discrimination starting at 40. People can join AARP at 50. They’re usually eligible for Medicare at 65 and Social Security at 66. Scientifically, though, a half-dozen aging experts I talked to for this story told me, there’s such vast variability in how people age that it’s ill-advised and even irresponsible to try to draw conclusions about an individual based on a date of birth. “There are people at 80 who perform better than 20-year-olds,” said Christopher Van Dyck of Yale University, “even on these cognitive speed, memory-type tasks.” Furthermore, beyond decades of a healthy diet and sufficient exercise, a significant, intangible, practically mysterious part of the nature of anybody’s aging, said Tracy Chippendale of New York University, is just … luck. Genes. Joe Biden’s father died at 86. His mother died at 92. People, said Denise Park of the University of Texas at Dallas, have to make a determination “based on the behavior that they observe.”

That’s essentially what Biden’s repeatedly asked voters to do.

“Watch me,” he said in June. “Just watch me.”