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I think that might be a little hard to do and I have always tried to stick within age group range. Maybe some more moms here could give better advice but I would say 1 game or 2 for each group if you can swing it.
How about things like cheese and crackers, meat platters. Chips are a good one, and cheesies. I'd stay away from vegetables because they can be a choking hazard, but fruit is fine. And cookies. You have to have cookies.