Do you invite your friends with kids of different ages to your child's birthday parties? We are having a themed party at a farm for dd who is turning 5. I did not invite our friends w/2 year olds because we are paying per kid, and the activities are geared to kids 5 and up (dd is the youngest of them). DH thinks we should have. WDYT??
If it was a party at home, I would invite kids of any age. Since you are paying by the kid and the activities are geared to older children, I think you're fine and the parents would understand.