That's not always the case, real maturity is often realising that something needs to change, and having the courage to step forward and state your arguments as to why it should change, if maturity was as you say, nothing would move forward, we'd still be living in the dark ages.
I was a bit sceptical about his main post, but his second actually changed my opinion on the matter, maybe there are 14, 13, hell maybe even 12 year olds out there that are mature enough to moderate a server.
I'm not saying that all 12, 13 and 14 year olds should be considered, but if they have been considered in the past, and with good yield, it seems nonsensical to not even consider extreme cases now.
Having said all of that, I will concede that it can be hard to know whether the candidate is lying or not, and that the person could be using a facade in order to gain the privileges for abuse, but on the whole, people will not want to waste the time doing so, as they will know that they will most likely be kicked from the team soon after abusing the power, so the time spent on the application will be wasted to them.
Hopefully this guy can get enough people on board to get his point noticed and considered for reviewal, good luck MrKorrenian.