This is like asking kids not to leave the house because the car traffic outside is too dangerous.
The solution is to reduce the traffic, and its speed, not to ban kids from leaving the house.
Also, the traffic is dangerous to everyone, not just the kids, even if they might be particularly at risk.
Don't penalize a vulnerable group; treat the problem instead!
On social media, we don't need age limits; we need better enforcement of content moderation rules!