I can start.
I certainly don't think it would be harmful, but I think the logistics around age verification are tricky. I probably don't have time to get into all that right now, but I think, in principle, yes.
I might even suggest going further, since we're talking about trans-border data storage, which is to say that you could ban the transfer of minors' data to countries with insufficient equivalent protection, if you wanted to, as well.
Yes, I think that would be a fine thing to add.