New Google Play Requirements

Developers are now compulsorily required to give information on their app’s end audience and content through the Google Play Console.

As part of new Families policies on Google Play, Google now requires all developers to give information on their app’s target audience and content via the Google Play Console, effective September 1st.
Google said that those who haven’t done so, should fill it out as soon as possible and consult the company's developer guide and training course for additional information.
Source: Google 
The new policy requirements build on Google's existing efforts on ensuring that apps for children have appropriate content, show suitable ads, and handle personally identifiable information correctly. It also decreases the chance that apps not intended for children could unintentionally attract them.
Source: Google