Bryan Johnson, a data-obsessed Silicon Valley centimillionaire, is promoting food and supplements that promise to help people live longer. Scientists say his program is highly questionable. So why are people flocking to it?
The National Institute on Aging may let funding lapse for a yearslong study of nearly 50,000 pet dogs, which could also offer insight into human health.
Winston, an older silverback, is getting enviable medical treatment. Now his keepers must confront an issue that vexes doctors and older humans, too: How much intervention is too much?