The turnout at September's General Election was up on 2014 across all age groups, with a 6.5 per cent increase in younger voters.
The Electoral Commission says overall turnout was 79.8 per cent of enrolled voters, the highest turnout since 2005 when it was 80.9 per cent.
In the 18 to 24 age band, the turnout was 69.3 per cent, 6.5 per cent higher than at the 2014 election.
In the 25 to 29 group, 67.6 per cent voted, up 5.5 per cent on three years ago.
The increase was smaller as age groups rose.
The turnout of voters who identified themselves as being of Maori descent increased 3.5 per cent across the Maori and General Rolls from 67.6 per cent in 2014 to 71.1 per cent 2017.