Sorry kids, you must be thirteen or older to use Cortana

[WindowsCentral.com]

Windows Phone 8.1 brings a handful of new features to the mix. Cortana and the new Notification center obviously steal the headlines, but other features like Battery Saver, Wi-Fi Sense, Start backgrounds and more all add up to create a wonderful update. Unfortunately, not everyone can enjoy these features. Cortana is currently only available as a beta to those in the United States, though you can get it to work internationally with a few tricks.
And it looks like Cortana is also only available to those over a certain age. Seriously.

Full story from the WPCentral blog...