The move comes less two years after the launch of the AI video app sent shockwaves through the media industry.
The owner of Instagram, Facebook and WhatsApp has been found liable by a court in New Mexico.
The government will interview the young people and their parents before and after they try the limits to assess their impact.
Reports it plans the biggest listing ever sent the shares of firms in its orbit soaring in US trade on Wednesday.
Customers who do not confirm how old they are or are underage will have web content filters turned on automatically.
A woman has been awarded $6m in a verdict that could have implications for hundreds of other cases in the US.