Pretty much all ages! Our 1yo and 3yo both had a blast but we saw children of all ages in there having fun!
My nephew stopped being interested around 10 years old, but my eight-year-old me still loves it. All of the kids had fun there from infancy on!
There are exhibits for all ages from 2 up thorough 12 or so. I had fun as a dad too.
Thanks! Your answer is awaiting moderation.