99% of the people think I am younger just by looking at me. Usually they say I have around 25 years, but I have 33. So I usually try to show indirectly to someone I am talking for the first time that I'm not as young as they think. Usually some people begin to treat me as if I was a very young adult, almost a teenager if I don't express myself enough. I don't shave my beard completely, because I think people would think I am a teenager.
About acting as a young person, well... I use some clothes that are more related to a young person, but I usually mix them with clothing of more mature people. I think in the end I look more younger than older. I like to go out and go to the streets at night, go to clubs, so I definitely have behavior of young people, I talk using some slangs and other things that look younger too. I started to work very late, only few years ago, so I am definitely less mature than I should for some things, like cleaning my own house, cooking, these stuff I am a completely noob.
For other things I am mature. For example, driving on a roadtrip, I try to drive safe as I am responsible for other people's lives. Saving money is also something I know how to do. I don't waste money. I have self control on drug usage. I work seriously and I am compromised with my job and what I do or what I say. I usually try to be educated with people, etc.
I have several friends that are younger than me and several friends that are older than me. I had relationships with people that are younger than me and people that are older than me. I have a good relation with all ages I think.
So, for some things I am "old" other things I am "young", but I guess I act more as a young person than an old person. I think my spirit is younger.