To me, punk rock is more about "do it simple, give no shits" than anything else. Making money isn't a problem, but caring more about the money is a problem. Growing old isn't a problem, but worrying about growing old is a problem. If you want to see some old rich punk rock, check out this video of Mick Jones playing at his local library: https://www.youtube.com/watch?v=UcL91CKyivE

Can't get more punk than that.