Ask HN: How do you prevent children from accessing your products?

After launching my first few apps, I'm running into an unexpected problem: younger children are the ones most likely to click my ads, using their parents' phones/tablets. This gets around the age restriction, and in fact, has a compounding effect: they are too young to have their OWN devices (so they just install and never use again), burn ad money, and most importantly, skew the target demographic towards users like them- so ad placements end up targeting more of them, because they're most likely to click!

This causes all my campaigns to immediately fail, no matter how much I play with the age restriction (again, parent's device). I've changed settings to stop showing in games and on tablets, which has helped a bit, but not fully.

Obviously, there is no chance I'm adding real age verification to the app itself.