Why do you say that?
My son is 2 and has had a Nook color and a Nexus 7. Both of which are passed down from us. Tablets (especially at < $200) are perfect for young children. They easily replace and are far better then all those stupid VTech games and toys that most children inherently obtain at that age from one source or another. My son has learned so much from the games and teaching apps we have bought for him. TBH in the long run a $200 iPad is a far better value then the aforementioned VTech toys which have limited usefulness and lifespans.
A four year old and 7 year old having iPad minis? An 11 year old having their own laptop? Pretty young to me.