For the inflatables, age 3+ is recommended. There are other toys for younger kids to play with.
There is no hard and fast age limits. Yes some ride is made for 3+ years. There is something for everyone.
https://www.pumpitupparty.com/kirkland-wa/faq/ As long as the castle itself is ok for your weight and height, you'll be allowed.
At the party we attended even adults were allowed to participate in the jumping
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