"But while the risk of life-threatening diseases, dementia and death rises faster with each passing decade of a person’s life, experts in geriatrics say..."

"... that people in their 80s who are active, engaged and have a sense of purpose can remain productive and healthy — and that wisdom and experience are important factors to consider.... It is true that older people tend to decline physically, and the brain also undergoes changes. But in people who are active, experts say, the brain continues to evolve and some brain functions can even improve — a phenomenon experts call the 'neuroplasticity of aging.'... Mr. Biden did not undergo cognitive screening during his last physical, and experts are divided about its necessity for older adults.... Senator Dianne Feinstein, Democrat of California, is obviously diminished at 89; she struggles to recall the names of colleagues and what happened in meetings. Senator Charles E. Grassley, Republican of Iowa, just won re-election at 89; he will be 95 if he finishes his term. Mr. Grassley is fond of tweeting videos of his early morning runs and sometimes does push-ups at public campaign events."

From "President Biden Is Turning 80. Experts Say Age Is More Than a Number. The New York Times spoke to 10 experts in aging to paint a picture of what the next six years might look like for a person of the president’s age" (NYT).

ppl ask me why i run 6 days a wk at 4AM pic.twitter.com/30NaTuMzpO

— Chuck Grassley (@ChuckGrassley) August 14, 2022