I don't remember exactly when it happened, but sometime around the age of 29-30, I started noticing more and more people around me blaming their poor performance, injuries, and lack of motivation on their age.
Given the actual age of people I hang around with, it is increasingly common to hear things like "my body doesn't respond like it used to" or "it takes me twice as long to recover as it used to in my twenties."
While all that may be true - I truly believe that you only really get old when you start using age as an excuse.
I turned 40 this year - but I don't consider myself old and I can certainly still out perform people half my age in the gym or ring.
I'm not delusional. I know that at some point my body is going to deteriorate to the point where I'm not going to be able to box (or probably even walk or wipe my own ass for that matter) - but I'll be damned if I'm going to let that happen before it actually happens.