From The Godfather
A USMC Gunnery Sergeant used to regularly tell me, “l’be been through more sea bags than you’ve been through socks.”
Never get in a pissing contest with a serious beer drinker.
My father often said, “Don’t get your meat where you get your potatoes.”
Thanks dad?
I don’t know if it’s an idiom, because I’m the only one I ever heard say it, but I’d tell people, “I’ve got work boots older than you.” and after a glance down; “I think I’m wearing them.”
I am aware of the contradictions and paradoxes of paremiology, but I’m just curious:
What does one reply to ‘you can’t teach an old dog new tricks’?
“It’s not my dog!” 
Don’t shit where you eat.
Don’t shit on my cupcake and call it frosting.
(Apologies for the vulgarities.)
How about:
Oh yeah? Just watch and try to keep up, oh young and foolish one.
Experience is what you get, when you don’t get what you want.