Roblox now uses an age check to unlock chat and decide who’s allowed to message you. That doesn’t set everything for you — check your privacy settings so only the people you actually want can reach you.
The move
Open your Roblox chat settings and keep chat to people you actually know and trust. Roblox already limits you to around your own age — if you want it locked down further, Parental Controls can do that too.
Seen via Childnet