In May, Stone spoke exclusively with ET about why she loves posting her own swimsuit-clad photos on Instagram. "I think that people are just astounded that you could be pushing 60 and still be OK," she quipped. "I mean, I've always been a jock. I'm naturally kind of skinny, and I think that people are just amazed that, you know, you don't have to fall apart -- but you don't!"
As for her secret to feeling and looking youthful, she added, "I think that I am lucky that I prefer to eat healthy. I listen to my body, and I like sports ... I think that it's the better way to live. And so, that's it! I just think that a healthy body, mind and spirit is the way to go."
Check out more of our incredibly candid interview with Stone: