Your friends are hypocritical [censored]s. The average age of a gamer is like 32 or something, maybe you should tell them that?
Agreed. You're friends are being d-bags. Do your friends do anything besides playing video games? Sports? Read? etc.? I'm over 20 myself and I have plenty of stuff going on outside of playing video games a few times a week.
I just graduated from college where I was a part of two fraternities (one social, one service) and a member on several other boards and organizations. While in college, I also played on the lacrosse club team (we were
terrible, but it was a blast) I've also had a steady girlfriend for the last 25% of my lifespan and am currently looking into working as a geologist for several environmentally-based companies. On top of that, I've been slowly learning how to play the ukulele for the last year.
I also love playing video games and Magic: The Gathering -- two notoriously "lifeless" pass-times.