player participation levels?

I'd be interested in seeing stats around the number of males and females playing between the ages of 16 and 25.

I would expect school years 9-10 to be the peak for participation.

Years 11-12 should have a lot of drop-off due to the distraction of exams, or kids trying to set
themselves up after leaving school.

After that, there's the distractions of trying to get set up, moving out of home, parties, changing social groups, cars, travel, finding jobs, the difficulty of finding a league suitable for players their age (rather than going straight into adult leagues), etc.

Do we actually see a lot of players coming back to the sport by their mid-20s once things settle down?