When did that happen?

So I was in bed the other night just about to drift into my land were all things are good when I thought back to my childhood and how I use to do handstands~ I would do them against the wall with my head on the floor and then in the yard trying to balance myself and progressed to just supporting myself with my hands.  I thought to myself when did that happen that I couldn't do a hand or headstand anymore? I thought for a second I can still do that but then quickly remembered I am bigger now and to let all my weight rest on my head is probably not a good idea and if I even tried a handstand and it didn't work out it could cost me some bucks having to go the chiropractor for a week! Oh to be young!