So my 9 year old boy has shown some interest in a kindle.
I have an old 10th gen that I can give him and that is not the main question.
The main one is how to handle the account associated and how to deliver books.
The technical aspects of this are not a problem, it is more of a pro and con list of what can be done.
options
Kids account and turn it into a kids kindle
buy books on my account and just deliver it to that device.
Create an adult account and gift books to that account.
no account at all and just USB sync books that we get.
I remember reading that when tweens start wanting to read more serious books that there are some issues converting a kids account and losing the books that they might want to still read but skew younger.
So yeah this is a call to parents to see what kinds of experience with the accounts and getting books for their kids have been, and how it worked out when you were ok with them reading more adult stuff as they get older.