Quote from onilink422
My server has way too many kids joining and the chattering is really getting on my nerves, how would I get more adults to play on my server and wean out some of the kids? Do I just ban them? Is that unethicle?
If you don't want kids on your server just ban them as you said. Players of Minecraft are free to choose what they do with a server if they are hosting one, so if you see the kids as being an issue ban them. You could also think about whitelisting.