Social media companies and the Australian government should be using their resources to remove predators and harmful content from platforms rather than banning under-16s, teenagers challenging the law have said.
From 10 December, social media firms - including Meta, TikTok and YouTube - must ensure that young Australians cannot hold accounts on their platforms.
Campaigners and the government say the law is necessary to protect children from harmful content and algorithms that can promote it to users.
But the policy is being challenged in the nation's highest court by two 15-year-olds, backed by a rights group, who say it robs them of their right to free communication.