United Kingdom, Aug. 15 -- YouTube is determining whether users are children or adults based on the videos they watch.

The site is using artificial intelligence (AI) to verify the age of users on the app in a trial that currently only affects a small number of users in the US at present.

However, the trial could be rolled out more widely on the video app - which is owned by Google - should it prove successful.

It works by scanning users' activity on YouTube to figure out whether they are likely to be an adult or not.

Google's James Beser, who is in charge of product management at YouTube, said: "We will use AI to interpret a variety of signals that help us to determine whether a user is over or under 18.

"These signals include the ty...