I can vouch for her having taken great care of herself. A few years ago she was on the Today Show demonstrating how she exercised every day. Mind you, she was in her early 90s at that point, and used a cane (a rather elegant one) for balance, but once she got down on the mat she was doing stretches and yoga poses I'd have trouble doing in my 40s.
Here's an article on her life from last year:
http://www.sfgate.com/cgi-bin/articl...sn=001&sc=1000