*JINX* Ha, posted at the same time - great minds think alike. As far as the height limit - no. My littlest - first time down slide was age 5 - my oldest (and very tall) - last time on slide was age 12. As far as swimming, though, there is no *swimming* in the mickey pool. There's hardly any water. Your 9 yr. old would be able to swim in the Goofy pool. Like others have shared, there is a lot of rough play involved at times - including jumping in (don't see how they can see through the water to know who's swimming underneath before they jump). Anyway, quite rough, but my kids did like to try the slide once or twice during the cruises.