My Google account is 21 years old and I still get asked to verify my age is older than 18 years.
On the one hand, it would be such an obvious proof of age that you've had the account for 21 years so why not pass you.
On the other, this would become a form of grandfathering such that all of us oldtimers and people in the establisent never directly see and experience the impact of these policies. It's mostly in the younger generations (still adults but their accounts may only be 5-10y) and people in exposed situations who get impacted.
So while it seems silly, at least process becomes visible.
I don't think country has an impact. I've experienced it in both US and UK with extensive years spent in both.