Wisdom and in order to become old and wise you must first be young and stupid :)
a better understanding of gravity
Eye wrinkles :O(
which i do
aches & pains
Maturity and too damn many aches and pains...
I'd answer that, but I forgot the question ;)
Realization about how precious is the time left:)...
Hair loss where you don't want it.
Hair growth where you don't want it.
certainly not flaccidity like that other duck quacked about.
Wrinkles and everything tends to sag downward..