The only piece of credibility I will give to this is that the mom did not like the trading and pressure of the older players to trade the good stuff away.
I have one league, soon to be 2, where there is a no trading policy.
The older "hawks" flew away, and the other kids just love being there at this point.
Some of the older players are still there, those who want to play, but the no trading policy is strictly, strictly enforced.
Makes parents feel comfortable, and yes, all ages are allowed.
As for the age restriction, no way. I may act like I less than love the masters from time to time, but the masters are the parents, are my kid's friends, and are good young people, for the vast most part.
Like any group, the cream rises to the top. The ickiness has to be dealt with by a strong league leader.
Talk to you all soon.
Vince