The average age of the New Zealand car fleet last year was 13.59 years compared with 9.93 in 1992, said the New Zealand Transport Agency (NZTA).
And the average age of used imports last year also went up, to 8.64 years against 6.07 in 1991.
The overall age of the country's carpark has gotten older every year since 1991-92.
But New Zealand is not the only country with an ageing fleet - light vehicles on United States roads reached a record average age of 10.8 years last year.
The older age of used imports must be particularly worrying for the Government, says Motor Industry Association (MIA) CEO Perry Kerr.