I'd like to see the voting age reduced if only because it would hopefully terrify adults into voting more if they thought a large voting block of children might go against them 😀 I've said in the past that I'd also like to see 'citizenship' classes in school which actually walked the kids to the place where they can vote on the appropriate day, to increase the chance of that youth block vote happening and 'forcing' 20/30-somethings to vote in greater numbers. It hadn't occurred to me to extend the franchise down below teens though, I'm massively intrigued by how that could work out. I suspect there is room for some nastiness in your proxy-voting proposal... but at least it would be different nastiness from the current system, which is itself far from perfect. Interestingly, my direct democracy proposal from the last election would allow changes in voting age (on issues if not on candidates) to be trialled on a local level.