Definitely not just for children! It's a really fun game for everyone, and it's a lot easier to have a crokinole board around the house than a pool table.
After building my own.. not much ;) big enough to be annoying to store (doesn't quite fit under the couch or in many tiny closets. A lot of them have hardware sunk into the bottom/back of the board for wall hanging.
But yes, super fun. See the youtube video I posted elsewhere in the thread for a pretty great 'review' of this game which dates back to at least 1867.