Gareth Morgan’s Opportunities Party has released a policy that proposes raising the alcohol purchase age, from 18 to 20.

It also wants alcohol excise tax increased to a level that would put up prices by 10%.

The purchase age was lowered from 20 to 18 in 1999. Parliament voted on it again in 2012 and decided to keep it at 18.

Morgan says lowering the age has caused an increase in harm to young people through motor vehicle accidents and mental and other health issues.