Anon above.
Vic domestic teams have been known to "wiggle" the age groups a little - where participation is a greater goal, but the "REP" teams (elite level) are not allowed to under BV guidelines - the teams we play at Classics etc. are comprised of boys/girls the same age as ours.
As for zoning being a plus for younger players, it's a bit of "each to their own" - but I know the "younger" boys age groups - U12s and U14s - at Easter were won by SA teams - Sturt in 12s and Sturt, Eastern Mavs and Norwood all making the semis in 14s. All of these teams played man, and the Sturt 12s destroyed the two teams that zoned them.
Even if this were not so, they would be miles ahead....in U12s. By U16s, when players have the strength to shoot accurately at range, you will find that maybe these teams struggle, as they do not have the man-to-man defensive principles to fall back.
But like I said, it's "each to their own". But our younger players certainly are not "easy-beats" at the moment.