Fat and 70 yes, lots. Fat and 80 not so much. Obese is a whole other story. Not many 400 pound people around to see 60. Off the subject a little bit, but you hardly ever see very tall old people either. One time I saw an ex NBA player in his 80's as a patient. He was still about 6'10 and his legs were hanging off the end of the gurney.
Yep, makes me especially worried about Shaq. If he packs on the pounds once he stops playing, I don't know how his heart is going to make it. Even Wilt Chamberlain didn't make it out of his 60s.