That thread discusses why <13 might be excluded, but I think it’s off the mark. The likely reason is that there are various laws governing what information you can collect from children < 13 on the internet, and it’s easier to simply exclude that category than ensure you’re complying with all the laws. I think it would be worth the effort for devrel to support that age group, however. Anything we can do to inspire kids to create games and not just consume them is worthwhile.
If that means communicating with parents instead of the kids directly, using the parent email tied to their account, that would work for me.