Is it normal to still feel like a teen at my age?

Hello. I'm an actor who has done film so my real name is not here, because I'm about to ask personal stuff.

I'm 44 years old, but look younger and have a younger attitude. I try to make everyone feel happy by joking around and playing around as much as I can, in a good-natured-ok I admit sometimes I'm a bit of a demon too-way.

I will be honest, although I have close friends of ALL ages, I feel more like myself with younger people, whose ages can range from 12-25, 26. I am very popular among the younger crowd, have always been. I even have a "cliche group" of teens who actually DO consider me to be one of them, we play basketball together, hang out together and speak on facebook (no phone calls or home visits, I myself have told them that would be weird). Generally speaking those teens, their parents know me and accept me. Some even talk to me like family also.

I have an 18 year old girlfriend who I just started dating and I DID ASK HER FOR AN ID because Im no lawbreaker and a law abiding citizen and so cheked her birth date, and she just says she has a crush on me and she loves spending time with me, talking and laughing and all and I like spending time with her obviously, we are knowing each other yet, and so far it seems a good match as we have tangible personalities.

OBVIOUSLY, I have never had sex with any younger kids and never also had any relationships, I mean that would be disrespectful and would break a potentially life lasting friendship. I have some friends who I met 20, 25 years ago when they were 12, 13 and still my friends. I have friends who are 60-70 and older, and I have friends who are 13-14 and who I expect to be my friends for 30 or 40 years down the road. I guess I am just a very likeable person that everyone feels they could talk to or listen to.

I honestly feel like I am still a teenager, perhaps a teen trapped in an old man's body. I feel I wish I could be 16 again, body-wise and hate realizing that my 44 year old body is telling me that due to injuries and stuff in a few years it might be time to pack the basketball bags.

I will let you know that I was in a coma when I was 12, due to illness. Recently I found out that I suffered brain injury during my coma and that the doctors at the time told my parents that due to the injuries sustained, my brain could stop from maturing at a certain point.

Now I am not mentally disabled. I attended college at 16, I have worked 9-5 jobs and appeared in film as I said. I also have a degree in modeling and am a capable writer and father figure to all my nieces and nephews.

Sometimes I look at myself on the mirror and even through like I said I look younger (and people do tell me that I look way younger than 44) I feel I do not know the face in the mirror, like in the Freaky Friday scene where Lindsay Lohan looks at herself and says she looks like the Crypt-Keeper.

Is it normal to feel this way and to be me?