The thing is, younger people tend to get annoying very easily. They like to talk a lot about things that older people aren't really interested in. They also seem to TRY to annoy older people at times. Also, younger people tend not to be as smart, therefore older people often have to do a lot of explaining to them so it can be a pain. Lastly, younger kids often can't handle sexual jokes. They either just don't get them, get disgusted and freak out or just tend to ruin the jokes.
Not all younger people are like this. They do not all annoy us (although most tend to). Also, not all are unintelligent and not understanding of what we mean.
There. I stated both sides. While I do try to get along with younger people, it usually doesn't work. I am on a server with two 15 year old people and one 13 year old. They all seem to **** me off at some point, especially the 13 year old (mind you he has ADHD). So as you can see, I have some proof to go against your point and some to go for. I just believe my point out rules yours. Understand? Also, if there are so many of you that don't like it, why not just make your own servers for people under a certain age? Just don't let the older people on I suppose. There, problem solved.
Age on the internet is just a number people label themselves as to try and fit in with the rest. If there's a server with ran by some 12 year old owners, all the sudden everybody is 12 because they feel its okay to tell the truth. But if there's a server with ran by 20 year old lazy college students, all the sudden everybody is 16+. I personally just tell the truth and let them judge me based on things that actually matter.
EDIT: Age limits are also pointless. Maturity isn't based 100% on age. And there's always a way to loop around it. If they ask to talk to you on skype you can say you don't have a mic. Things like that.