Santos Flaniken The MMA/Judo Teacher I work with on occasion is almost 60 and can still flip up to his feet (without using his hands) from the guard...There is not a stud in his class he can't submit.
http://take-down.com/bio.htm
To his credit Santos is always bugging me to get in top condition since We Aikido Dudes tend to be "softer" than most Martial Artists.
It's amazing what one can do if one stays in shape.
William Hazen