Thanks for asking this question! DS1 is also 4 and I thought they had to be 6 to start... We're now looking into getting him started this year.

I think 4 is fine to get started. They don't really play a game, they just have a run around and do different activities. I don't think anyone expects them to be able to concentrate for long periods of time. It's just an introduction to footy.

My husband is a footy coach so our son has been in training since the day he could walk. Lol