The people who say that younger children can be mature don't usually realise some of the issues we have to deal with.

This includes (unfortunately) child predators.
Hackers who try to find our your personal information and attack you (I've had my internet cut off from someone DDOS'ing my internet connection specifically before)
People who will bribe you quite large amounts of money for favours with customs or items or anything else (recommendations ect.)

There's a lot more to the position that people realise and a lot more pressure.
Different time zones can have different expectations on how you're expected to perform, you have to meet minimum levels of activity or get stressed to improve.
Yes it's a volunteer position and you get paid in gralats and EC but it's a lot of work

The minimum age is technically 13, but it's absolutely not a position for children. Do you think kids who apply are really ready to face such situations? People thinks it's a popularity contest and that they're "graal famous" but it's a completely different world.