Here is a guide from the Office of Film and Literature Classification.

DIGITAL CITIZENSHIP

Gone are the days where the whole family sits in front of the tv watching the same show together. 

The more likely scenario is one where mum and dad watch a show together and the teenagers are watching something else somewhere else. Nowadays young people can access virtually any content on their devices – anywhere, any time. As digital natives, they can and should make use of these opportunities for communication, education, and entertainment.

But young people can also be negatively impacted by what they see. We know this from international studies, our own research, and from talking directly to parents and teenagers nationwide. Young people are looking for guidance – we know because they’ve told us so. We also know that parents and caregivers are concerned about what young people are viewing in movies, TV shows, games and websites.

Here is a guide from the Office of Film and Literature Classification. Read the article, but there is also a PDF Guide that is useful for starting that conversation with your son: 

https://www.classificationoffice.govt.nz/news/latest-news/challenging-media/