Apparently, Windows Phone's new virtual assistant Cortana has been worrying government officials with its smarts. In its current state, Microsoft's voice recognition system falls under the Children's Online Privacy Protection Act, which limits its use by children aged under 13. If Cortana detects users are below the age limit, it will turn down their request with a polite "I'm sorry, you'll need to be a bit older before I can help you."
Why is that? Luckily, the situation is far from the privacy concerns that plagued the launch of Microsoft's Kinect 2.0 controller last year. Since Cortana is quite the personalized assistant, the amount of information it collects and sends to Microsoft's data cloud for processing is above the COPPA act's "don't intervene" threshold.
As Cortana is still in a "beta" stage, perhaps Microsoft will consider giving parents the ability to disable certain features which will make the assistant usable by children. However, it might be difficult to pull off such adjustments without compromising Cortana's functionality in some way.