I'm not sure I understand the purpose of lowering the age. I think 15 is low enough. There's a lot more to hosting than just saying "I'm the Host!" and letting the adult handle all the problems.
Yes and there is no guarrantee that a 15 year old will be able to handle all those responsibilities either. That is why my caveat is that the adult for underage hosts should also have experience hosting.
I'm just saying that I know 13 year olds that are willing and capable of hosting a local and I think it would go a long way to incresing their investment in the game if they be allowed to shoulder some of the load if they are willing.
What about 13-15 you can only host locals. 15-17 you can host locals and districts 18 and up you can host any level of redemption tournament?