Dust,
As you realized, your never too old to PE. Sure, you wish you could have found out about this 30 years ago... but then it wouldn't be as much fun as it is now. What would you be spending your time on then?
You praise the ones that invented these exercises.... One of my continual quests for knowledge is to figure out
the orgin of PE. Where did it come from? Who invented it? Why is it just now coming out in the open?