Even entering DoB is imo too much of a privacy breach. In my view, they should just take the highest age bracket described, apparently 18+, and then ask that on OS installation: “Are you over the age of 18?” If the user says yes, it installs, and every app is hardcoded to receive that 18+ bracket when checking demographic. If they say no, then it simply replies that users under 18 may not install it under the laws of California.