Seems like an interesting concept. I’m surprised that legally they are allowed to have 13 year olds race against 15+, but maybe that’s just an issue at some tracks/in some states. I could see this having some showmanship material and potentially bring some attention to karting, hopefully in a good way.
Based on our current structure in the US, a race like this including 13yo’s isn’t a big deal to me. I’m of the opinion that money races, and “pro” races in general should showcase the best talent. From a legal standpoint, 13yo, 15yo, and 16yo are all the same here (I’m no legalologist tho ), so I think it should be a judgement call for the series/promoter.
This is where having some sort of licensing system sure would be nice, in order to have a quantitative system for who makes the cut to move up, and who doesn’t.