Difference between 50 and 60 is substantial. Difference between 60 and 68, which I am now, is mind blowing. At 59, last year I practiced Uechi Ryu, I could still kick head height with force, and was still splitting boards and blocks. Head kicks were mostly for show, as the infighting techniques taught nothing higher than abdominal kicks. Now, with one back, one abdominal, two wrist, and one foot surgery done in the last five years and a shoulder surgery coming up, ain't gonna happen. All that repeated trauma and sins of youth come back for their payback. Snake, your right about most people telegraphing their intentions. Know your enemy before they realize they are your enemy.