Any app that has access to your age category has access to your home directory where much juicier things live. Probably including your email address, and all your passwords.
I'm a little special and use a hack so I don't even have to provide my e-mail address on git commits to prevent leaking it in my git history. So probably not in my case, but I understand your concern and a lot can be done to improve OS privacy. But "they already know what you eat for breakfast" is not a valid argument to reduce privacy further.