"At what point are you old?"... Chances are that if you are asking yourself, or anyone else that question, you feel for some reason that you are "old".

The term "Old" is so subjective to me though that it nearly has no meaning at all.
Example:... I ride a 1985 Fuji Mixte, I'm 50 years old. A gentleman I met on the trail who was every bit 10 years my senior, asked "why do you ride such an old bike". My answer was "what do you mean old, that's the newest bike I've ever owned". And it is, I love the Vintage stuff.
I've got a friend that calls me "Old Man", or "Old Timer", or "Old Fart" all the time... He's 2 years younger than me, three quarters bald, and what hair he has on his face an head is snow white. I've been told I could pass for someone in my late 30's or early 40's. My friend gets around fairly well. I have to walk with a cane due to degenerative arthritis in my hip and lower back (which came to be in my 30's). So, can you judge age by looks???
Something or someone will always be older than you. Something and someone will always be younger than you. Age is just a number and we all degenerate at a different rate... So why do people worry and judge so much by numbers?