Well I'm 45 and gig regularly with a punk band. The other members are over 50.
I have friends with whom I go youth hostelling a couple of times a year - again the others are 50+
I still have all my piercings and bright red hair.
I wild camp with my child.
I go to festivals and camp on my own or with my child.
I work full time in a professional career.
I can't see much of that changing in the next 5 years or so.
So I'd also like to know 'over the hill' for what?