Asolutely not. If your physical peak is only 19 and it's all downhill for you from there I'm 23 and I feel like I still haven't hit my peak, I'll probably hit it when I'm in my late 20's tbh but that's much better than peaking when you're a teenager
I turned 19 two months after I graduated, and I knew several people in senior year who were already 19. If you're born late in the year, it's pretty common.
probably a different school/age system. Over here if you're born late in the year you'll still be 17 when you graduate.
I'm 23 and I feel like I still haven't hit my peak, I'll probably hit it when I'm in my late 20's tbh but that's much better than peaking when you're a teenager 
