The interesting thing is that sporting ability for certain months of birth continues beyond school. So in adulthood, where there's likely to be a mix of ages and the athletes have fully matured physically, it still seems to be the case that certain months of birth produced more successful athletes.
That's to be expected though isn't it? Somebody mentioned earlier that the bigger, stronger kids get picked for the school footie team, maybe get preferential encouragement, better exposure to wider, more serious competition at an early age (inter-schools champs, local/regional junior competitions...) which stands them in good stead for continuing their sporting ambitions later in life. Their 11-month younger school colleagues will have caught them up physiologically by adulthood but would have had a different experience with sport which will affect their later development.
Just to compound being born in June, I skipped an academic year and ended up being much less, er, developed, than many of my classmates. I was always the little kid put in goal! (Ironic really, the goals were massive!) Maybe I would have been more likely to get involved in team sports as an adult if I'd been in the school team?? Instead of being the sad lonely runner...
