dagPresumably Mastodon is not on the under-16 ban for if someone can work out how to set up a Mastodon account, they also would easily be able to circumvent any security settings.
LillyLyle/Count Melancholia@davidallengreen Mastodon has previously let it be known that they are technically unable to have an age certification in the way BlueSky has, due to the way the software is set up.
If I find the reference, I'll send it along to you.