I would set the minimum age at 13/14, as many other countries do. What the hell does 16 mean? You are literally preventing teenagers from organising themselves properly to go out with friends, from spending time on the bus doing nothing, etc etc.
Stop with this bloody alarmism about 'social media is too addictive!!!!' Instead, think about banning the stuff that is actually a problem, like doom scrolling
I gotta add this to the original comment so everyone can read also, i'd reply better but another user did the work for me and i agree with them