It's a tricky problem, actually. My game as an example: Almost half of the users are under 18, but most of the other half are in the 18-35 range (according to

It's a tricky problem, actually. My game as an example: Almost half of the users are under 18, but most of the other half are in the 18-35 range (according to Flurry metrics, which guesses what the age of a user is based on what OTHER apps on the device are reporting -- I'm not asking them myself). Unless I ask each user how old they are, I can't know whether or not to serve them ads. And if I DO ask them, then people often feel like I'm prying too much. ESPECIALLY if I'm asking if they are under 15 (and finding out they're under 13 would cause COPPA to kick in [1]). I already have the "no adult ads" selected in my ad provider, which is supposed to block singles ads, but I've seen them come up anyway. Presumably if I fed them an age that I'd gotten from a user they would be filtering the ads more, if only to target them better. Don't know. [1] http://www.coppa.org/ http://www.coppa.org/