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I'd say the lower limit is whatever age at which the kid understands not to make a lot of noise and knows not to simply pick up anything his hands can reach.

This could be as young as 6, though I know people well into adulthood who are not quite at that age yet either.

Basically, I'd treat it just like taking a child to a restaurant or a movie - if the kid's not behaved, it's a detriment to other peoples' enjoyment of what they're doing.