Not sure. My intent was to draw a parallel between the fitness to serve of Trump and an 14-year old candidate for governor. If one is a serious, electable candidate, so too is the other, except the 14-year old might actually be a better choice, because it's still possible that he'll respect women and minorities, eat his vegetables, and earn the "Citizenship in the Nation" merit badge.

With the speculation that Trump might have been defeated if anyone took him seriously as a candidate earlier and invested more in ads to discredit him, and in the current political climate where public bullying is accepted as normal, sure, you can go negative against a kid. And as he has no voting record, the only source material for attack ads would have to be his public school permanent record--or, as mentioned elsewhere, maybe the Discord chat logs for some MMO guild full of 14-year-old boys.