Until about four years ago, the driving age in New Zealand was 15. The drinking age is 18. Many people in the rural district where I live learned to drive as soon as possible so that they could take themselves and (with a suitable endorsement) their sibling(s) to school. After becoming and being responsible drivers for some time, they then reach the drinking age.
The OECD people thought that, with NZ having the lowest driving age in the bloc, they were a long way out of kilter. Also, since the turn of the century, many NZ insurance companies became owned by Australian insurance conglomerates such as IAG. They could not cope with 15 year olds driving cars and the pressure mounted on the government to "do something". They responded by upped the driving age to 16 even though there were no proper statistics to support the fact that generally cautious 15 year olds were causing a lot of crashes.