I am just 52 1/2, but grumpy as hell. My elder son that lives with me uses to dress like a goth, so there's a lot to be grumpy about.
But I am happy that he likes my kind of music, he plays with me in my cover band since he was 14. Not all stuff, but the songs that are too difficult to play for our rhytm-guitarist who is also our singer. Lets say, a dual guitar solo with the lead guitarist and stuff like that. He loves that a lot, likes the tunes, likes to play with me and the band.
So, as I can say, there is hope for mankind. At least for music.
So give me a number, I want to tell my son that his behavior and dress code made me join a club with the name "Grumpy Old Farts". Maybe this is enough to make him get a haircut....