I think my back went out!
Old age and experience will overcome youth and exuberance!
I Hope!
If not...
If you can’t dazzle them with brilliance...
Baffle ‘em with Bull$hit!
There's some old adage about your youthful face is a gift but when you get old, you're stuck with the face you deserve.
I guess that can hold true for one's physical condition to an even greater extent!