What's the best age group to take here?

Best for preschoolers to 12 year olds, although my teens did find enough to keep them interested for a while.

I would recommend toddler to age 8 or 9.

It is best for families with school kids

Best for ages 2 and up, even adults like us find some things fascinating

Out the womb to the tomb, any age will be interested.

i would recommend upto eigth graders

There's great stuff there for every age group, though you'll probably get the most benefit education-wise with kids over 8.

I took my 2 year old and she loved it.

Toddler size and up

I would suggest grade school kids and older.