Google keep asking for my birthday

So my stock Pixel keeps showing me a notification saying "Account action required" and "Add your birthday to your Google Account now to help Google comply with the law". It pops up every few days.

[https://i.imgur.com/1F09hx9.png](https://i.imgur.com/1F09hx9.png)

I just keep ignoring it and nothing seems to go wrong. I assume the comply with the law bit is about knowing I'm old enough for them to show targeted ads to? I'm pretty sure they know just fine what my age is without …

asking google privacy