As several guys have mention before: Squeaker may have originally been related to preteens with high-pitched voices -
but to me, being a squeaker mostly being a state of mind that isn't limited to any particular age. In fact, tonight I came across a 51 (so he claimed) years old squeaker... you know, that kind that plays every day, is giving orders, is calling out "hacks" and "BS stuff " a hundred times on 200 and is constantly complaining about his own team in general or specific player in particular on country channel.
No enthusiastic 11yo can be
that annyoing... and of course there is also hope he will grow up and mature... with adult squeakers, all hope is lost.
So have patience with the young ones ... try to help them, else just squelch them