Until the stump of my dad's amputated leg started playing up, confining him to crutches, he too was a stong and active man. It's breaking him psychologically that he can no longer do what he once could and the lack of activity is hurtling him to the grave I fear. Still he's done well for the men in our line that he's made it past the mid-70's.
It just goes to show that 'training' never stops and it is to your benefit if that is so.