I'm not sure if you want people who are 18+ for legal reasons, but if you just want people your age, there are plenty of mature people that are younger than 18, I know some fourteen year-olds that are more mature than adults.

And as darkeye says, most minecraft players are 16 and under.

Won't get much attention :/ 90% of the players are younger then 18 (including me, being 16). I rarely see people the same age or a bit older than me. Not hating on ya. There will always be someone that totally fits you. Just letting you know

You're lying about your age.
On one of your other forum posts you stated that you were 20.