You don't want them to know your real name and age? Then don't use them. Social media is harmful and so it needs more regulation and safety. You can't enter a casino right now without an ID. You either accept that the casino will know your name and age when you enter it or you don't go to the casino. It's so funny when tech folks think their little shitty thing is something special that should not have to follow any logical common sense laws like everything else in the world.
Besides, the whole point of social media is to connect with friends, family and other real people. Being anonymous is anti social. People who are scared of disclosing their real name are the ones who shouldn’t be on social media anyway. If we all had real identities on social media it would be so much less toxic than it is today.