I hear of seemingly frail 70-something year old men all the time practicing Aikido, but have never heard of a 60-70 something year old woman practicing. Anybody know of any little old ladies they know could send an attacker flying in a heartbeat?
I'm not sure how old Wendy Palmer is, I'd guess somewhere with a 5 in the front of it, so maybe not exactly what you are looking for, but she makes the ground really hard these days. Isn't Mary Heiny in the 60 ballpark? George Leonard is the oldest person I see with any regularity and he's in his late 70's.