@courtney: Try contacting firstname.lastname@example.org if you're still unable to install the app. The teen rating is a function of the attendee networking feature. Also, any app that involves being able to message someone without moderation is going to get that rating. External links to sites such as YouTube that may contain unmoderated content is likely also a factor :).
@wiredjack: The Microsoft Ignite app should be available Friday (9/16); we'll post on Twitter as soon as it's available. It will include (among other things) a lot of conference information :). You can also check outthe Microsoft Tech Community. The Microsoft Tech Community is where you can ask questions, network with other attendees, interact with speakers, and join conversations about the sessions you're most interested in. To learn more about the Microsoft Tech Community, visit the Community Info Center.
You can access the MTC without having to login, but you will need to sign in to participate in conversations. You can sign in using your organizational email address or Microsoft Account (MSA e.g. outlook.com email address). To learn more about the Microsoft Tech Community, visit the Community Info Center on the MTC.