This thread is actually the first time I've seen any reasonable debate about this subject.
I don't see how they can crack down on this though. There is little if any documentation to prove their ages are anything other than what they say. And honestly even if they are, the Kenyan juniors would still pound our juniors just like their senior men do. Drugs or no drugs, Cathal Lombard, Dieter Baumann and Regina Jacobs are proof enough that there are western runners taking drugs too, and they still got beat, although they were competitive for sure.