Two examples from Broadway shows proclaiming the up-side of aging:
"No Time at All" from 'Pippin' (S. Schwartz)
and
"Thank God I'm Old" from 'Barnum'(Coleman, Stewart)

Favorite line from the former:
"Give me a man who is handsome and strong
someone who's stalwart and steady
give me a night that's romantic and long,
and give me a month to get ready."