You typically cannot change someone like this with evidence. They must be personally affected or isolated from their politics before they will even consider it
As said by others creating a giant community of under age kids where anyone could just claim to be under 18 is a bad idea but also any kid could just claim to be born in 1942 like I did when I was a kid
I personal use graphhopper and it's great but I'm sure my location is still tracked, maybe just not by Google now. You do what you can but there is no way to not have yourself tracked some way or another.
Why would you want to do this