George and Chuck,
Right on! Right on!
I'm a 48 year old nidan, somewhat horizontally challenged, but I can hold my own in stamina, too.
The best part about my teacher (besides the way he teaches) is that his responses constantly enlighten me, With his background of aikido, aikijitsu, tae kwon do, te, and boxing, he definitely can hold his own, but when in on-mat or off-mat situations I sometimes feel he avoids the situation, I realize he's won by not fighting, literally or figuratively. Takes more strength, but is also incredibly more elegant in execution. Also, brings to mind "no one comes out of a fight better than they went in."