Tinder is used by millions of people every day to find love or lust. It’s also not exactly where you would want young children to be stumbling around.
If Tinder says you are age restricted it means that your account has been flagged as inappropriate for the app. This is use to the young age or because of your location set in your profile.
You can update your profile to remove the restriction by going to “Edit Profile” on the app and correcting any information that is wrong.