If you're just looking for an hour or so of playing, I'd check out Lonewolf. I've played the Mt Clemens location for a bachelor party a few years back and it was a good time. It's also a smaller place, so you may be able to get a dedicated game... vs. playing with people you don't know.
If you're looking for more of an event / half day of playing... definitely check out Hells Survivors. They use to do a morning session, then an afternoon session.
Minors need a signed waiver. If you've never played paintball, you may want to consider going & playing once before pulling a bunch of 13-14 yo'ds into a game. I'd be a little leery of taking responsibility for a group of kids that age, handing them a gun & mask, and telling them to go for it. Maybe with parents attending too it would be better/easier. Just keep in mind - this isn't laser tag... when you get shot in the head, mask, balls, etc... it hurts. Think welts. Not saying don't do it. I have a friend who brought his ~13 yo with him playing & it was great, but it was like rifle deer hunting rules... they stayed together while on the field, etc. Even more so if you're going to be in a public game w/ people you don't know.