Wish I still had my first track bike, a Reynolds 531 Helyett Speciale, bought for me by my parents in 1964, when I was 13. I've never not had at least one track bike since then.
So I've been riding fixed-gear bikes for about 57 years. Still doing road rides of 4 or 5 hours in hilly northern Baltimore County with a 72" gear, the same as the gearing I started out with.