I've still got a phantom child on my Apple account because when I tried to create a child's account many years ago for my son it somehow messed up and used the current year instead of his birth year. Support said too bad, no possible way to fix that. So I had to create another account for my real son, and while he grew up and moved out, my phantom son still lives with us for another nine years until it is old enough that I can delete it.

I hope he at least gets his own cake on his birthday.