Would 22 be a better age minimum for joining the military than 18?

I feel like a lot of young people are coerced into joining right out of high school because they feel like it's the only way they can afford college or the only way they can make something of themselves. At 18 a person's brain isn't even fully developed yet and I feel like a lot of them join the military without really grasping the reality of the decision they are making - they get swept up with what the recruiters are saying and they are just thinking about getting college paid for and not having to work at McDonalds, etc. Plus you aren't even allowed to buy a beer at 18 but you are allowed to donate your life to the whims of the US military leaders?