[protagonist]

Age limits still don't make a difference.
I'm not going to work my butt off to make a server so that some guy who has a job and goes on the server 5 minutes a day to check on how things are.
Most people over 18 or even over 15 have jobs in the summer, and sometimes over the year. I know I have one this summer (though it's not that demanding). It's not fair to the staff for a Manager to log on for 10 minutes a day, when that happens you have miscommunication which can lead to very bad outcomes.
Generally people under 18 have more time to spend on games. That means they have more time to spend managing a server if need be. Even if they aren't the most mature people in the world, someone needs to be there to keep the peace. As long as they aren't giving out items to friends, giving RCs to friend or allowing their staff to break rules I don't see why any position should be restricted to rules.