In the case of the UK. Age ratings for cinema and home video are handled by the British board of film classification (BBFC). https://www.bbfc.co.uk/
Over the last few years the definition of home video release has changed to include what is on streaming services.
it has been mentioned that age ratings are not universal. This is true, but UK and US age ratings are fairly comparable in most cases.
The UK age ratings that would be applicable in the case of viki would be
The closest UK equivalent to PG-13 would be 12/12A. I should point out that 12A relates only to cinemas and not home video release. Anyone under the age of 12 must be accompanied by an adult. Most cinemas have a rule where if the child appears to be under eight. They won’t let them see the film even if they are accompanied by an adult and anyone 12 or over does not have to be accompanied by an adult. Link below contains more information about the kind of material classification can contain.
https://www.bbfc.co.uk/about-classification/12a-and-12
The closest UK equivalent to the restricted rating in the United States would be 15. In the UK cinema must not permit anyone under the age of 15 to see a film which is rated 15. Persons under the age of 15 are also not permitted to rent or buy films that are rated 15. The link below contains more information about the kind of content but cinema or home video release that is rated 15 can contain.
https://www.bbfc.co.uk/about-classification/15
The closest UK equivalent to the United States rating of mature or 17 would be 18 as with the age rating of 15 the same restrictions apply to the 18 age rating. The kind of stuff you will find in content that is rated 18 is of course more mature
https://www.bbfc.co.uk/about-classification/18
As content that is on streaming services is now considered to be home video release UK regulators are one by one, nudging streaming services to introduce parental controls largely for the purpose of giving parents the necessary tools to more easily protect young children from stumbling across things they shouldn’t. Parental controls are encouraged, but not legally required. As of yet, unless the streaming service in question provides access to linear TV channels over IP, in which case new rules came into force a few months ago which mean that access to certain linear channels, mainly movie channels must be restricted by a mandatory parental pin. And no one under the age of 18 can legally subscribe to a subscription service.
There is one age rating, which is higher than 18 and that is 18R I’m pretty sure everyone can guess what, that’s for.
Recently, UK regulators have managed to get Netflix to submit and Netflix now has rather sophisticated parental controls and adopts the UK age ratings for content where said content has been given an age rating by the BBFC.