As far as minimum age - If there is no international standard or rules, then that means the host country at the time, gets to cook the parameters of the contests. making the whole idea of an 'international olympic commitee' a farce.
sorry, cheating on age in the olympics is the same as a 220lb boxer fighting for a lightweight title. ...nothing to do with culture, it's cheating.
if the age minimum needs to be reduced, or a new division added, fine - but let it be with universal and enforced rules.