Is it normal that my age lies?

I'm 20 and I relate more with people in their 40's.

I still can not believe the white haired (at least I still have all my hair) old fart looking back at me in the mirror is really me.
With no wrinkles, creases, bags under my eyes or double chins, I really do not look a great deal different than I did at 22, except for the hair.

Time passes quickly. Today you might be 20 and feel 13 but tomorrow you will be 30 and feel 20.

Delayed adolescence. Blame the media/your parents (if you have any).

I'm 19 but I feel 30 /:

I have no idea what I am.

Im 30 and I act 16

Weird. I feel much older than I actually am. Even though I can be immature at times.
I believe this to be normal, though.

What makes you say that?