No, seriously, there's an age limit that he agreed to when he signed up.
It's a law.
Most of us tend to forget that we are the product that Google is marketing.
REGARDLESS of what you think you need to do to comply with COPPA or any other law in the United States or any other jurisdiction;
IF you have automated processes that cancel accounts and freeze data and do not offer at a minimum, an opportunity for the person affected to retrieve his/her data entrusted with you;
THEN, this will keep happening (Google-made-me-cry stories).
THEREFORE, in order to reduce the number of Google-made-me-cry stories, you should:
IMPLEMENT a system to allowed users adversely affected by your automated processes a way to RETRIEVE their data, all the time, no matter what, come hell or high water.
IN FACT the account_delete() function shouldn't even take an ARGUMENT about whether to allow data retrieval; account_delete() should have a non-overridable call to allow_account_export_for_thirty_days(), if you KNOW WHAT I MEAN, which I nearly think that you DO.
BECAUSE this isn't rocket surgery.
AND BECAUSE we get upset if we lose our data. We become WROTH. You wouldn't like us when we are WROTH.
IT is the LEAST you could do. Seriously, it's the minimum. The absolute least. You could do more, if you wanted to. But this is the least.
SINCERELY, The Internet.
There's even a specific safe harbor for Google to disclose a child's personal information to the child's parent.
"The Children's Online Privacy Protection Act and Rule apply to individually identifiable information about a child that is collected online, such as full name, home address, email address, telephone number or any other information that would allow someone to identify or contact the child."
I'm not sure why you guys are always asking Google to do things. It's like you want a single, big entity to have all dominating powers over your online-life.
Maybe it's just me, but I think that's just plain weird.