Sweeney is a contributor for TIME. Photo-Illustration by Chloe Dowling for TIME (Source Images: Natalie Board—Getty Images, Ira T. Nicolai—Getty Images, Tess Trunk—Getty Images, fongfong2/Getty Images ...
Staying mentally sharp into your 80s and 90s isn’t luck, it’s daily upkeep. The people who age best tend to protect their ...