This is a great topic and I think you really get to see how peoples minds work to a certain extent on their responses.
Cyclerider - Very straight forward, your age is your age
Greg - Difference between how you look and how you feel
For me, I find the older I get the more broad the feelings become. When you are 12 you can't wait to be 13 and be a teenager. When you are fifteen you want to be 16 so you can drive. When you are 17 you want to be 18 so you can get into clubs. We joke when we hit a certain age that we are only 29 or you are only as old as you feel. It is funny how our perspective changes as we age.
I happen to have a special needs child who is now 15, but I remember when he was about 6 and playing in a special needs soccer league. I was chit chatting with another Mom and I asked her how old her son was. She really had to think about it, took over a minute for her to tell me that he was now 17. I found it odd that a mother did not know how old her child was, but really didn't think about it till many years later. When you have a child with special needs, age really truly just becomes a number and nothing else. You learn to gauge things by milestones not by numbers. You don't think oh he is 15 he will be driving next year. You think woohoo, he learned how to spell his name.
So for me, I don't have an age, well I guess that is wrong, my birth age is 43, but somedays I get to be 14 and somedays I get to be 60. I don't really think about it. It is just a number and nothing else.
Stacy