I don't have a DNI because I think they're stupid/cringe and never actually work, so I block freely instead. However, I do specify in my bio I don't want anyone under 15 interacting just so 14, 13, etc year olds aren't surprised if they get blocked. Generally, just don't be a bigot or or annoying and you'll be fine. Although I am pretty strict with the former... Feel free to DM me for a less vague answer. (Just sent an ask with ur username if you're unable to, I won't publish it)