I know many likes to think they are getting old just because they listen to music which isn't as hip or trendy nowadays, though couldn't it just be that one knows for sure what music one likes? When one is younger is easier listening to a lot of music just because it is a lot heard in the radio or just listening to what most other people your age listens to, or what your friends are listening to?
I think what made me realize I was getting older is the sign of wrinkles and less elasticity in some face areas, and seeing as well as knowing most people my age has gotten a family and seemes to have settled well into life with career, house, car, e.t.c... I still feel very energetic for my age, I can also feel like a child which is put into a grown up body. Haha!
I also don't feel like I fit being into the age I am in now, I can look at a lot of the people being my age and feel like they are older than me. Still, I don't feel like I fit being with much younger people than me either, and I do have some friends who are around my age. I am just not very typical for what is seen as acceptable and best fit for when you have reached the 30s, I still want to laugh and have fun. And keep on learning as well as feeling more alive, like a child I want to keep on exploring and revive up the senses given to me.