I probably know the answer to this with common sense, but as it isn't specifically mentioned on the TTMA website I'll ask anyway.

I would be happy to help out with marshalling on the odd occasion (only the odd occasion as I like to photograph the action too), but, when I'm there I'll be with my son who will be 14 next time we come over. Can he stand in the same(ish) place when I'm marshalling? If not (and I would expect it to be not) then I can't do any marshalling until he reaches 16.