The law says it must ask for age when creating an account other than the first one. So that's mandated. But there's no verification of the age you enter, and in fact, it's forbidden to verify it. It's really just to give parents the option to set up child accounts.

"The law" There is no "The law" there are multiple levels of government implementing multiple solutions all different and somewhat incompatible.

Honestly, probably by intention. Its sort of a SLAPP attack on the entire world population.