You purposefully let yourself slip. I'm 41. I listen to new music, I understand kid's clothing styles (I was not that different in the 90s), I've kept up with modern technology, I kept moving (due to my labor intensive job), and I've eaten well. That's all on you bro. Old does not have to mean outdated.
Edit: reminds me of my Dad who pretty much stopped listening to any music produced after 1982 and has his garage radio permanently set to classic rock. I made a promise to myself a long time ago that I will never stagnate like that.