Barnsley argues that these kinds of skewed age distributions exist whenever three things happen: selection, streaming, and differentiated experience. If you make a decision about who is good and who is not good at an early age; if you separate the "talented" from the "untalented"; and if you provide the "talented" with a superior experience, then you're going to end up giving a huge advantage to that small group of people born closest to the cutooff date.
Explaining why most members of a competitive sports league are going to be aged close to the sign up cut off date: the younger adherents are smaller and less developed and therefore get winnowed out by those that are closer to the age cutoff date and therefore are older and stronger.
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