Required minimum age for Google account is 13 according to their website. They have set an age limit for some parts in the world. It’s completely finalized the age limit for every region in the world like in Asia, age limit is same 13 but in South Korea, it’s 14 and in Vietnam, it’s 15. In most of the regions in Europe, the age limit is 16 plus.
Some google services like You Tube, Google payment have the specific age requirements. They both have the minimum age limit is 18. On You Tube, they have set videos on age restriction. Google Ad Sense also have 18 plus age requirement. Google can disable your Google accounts if you put incorrect date of birth.