good to know that `grep` will have to check how old i tell my os i am before it will do anything

Which seems like a silly accidental overreach of the law. If that is the way it applies.

The literal reading of the law says this only required when a child is the primary user of the device.

> (b) (1) A developer shall request a signal with respect to a particular user from an operating system provider or a covered application store when the application is downloaded and launched.

but 'user' here is:

> (i) “User” means a child that is the primary user of the device.

So these rules should only apply to accounts/devices where a child is the primary user.

Grep on an adult's machine would not need to check how old you are, at least with a literal reading of the law.