The Government will not be lowering the voting age to 16, Justice Minister Paul Goldsmith has confirmed.

Reducing the age from 18 to 16 was one of 140 final recommendations from the Independent Electoral Review, but Goldsmith has already confirmed it will be ruled out.

Advocates say they're incredibly disappointed the Government is rejecting the idea.

Goldsmith told Summer Breakfast this morning the system treats people younger than 18 very differently to those regarded as adults.

“We've had a voting age of 18 for many years, you can argue about it but we think that 18 is fine and appropriate," said Goldsmith.

"We just don't see it as a priority for our focus of attention."

Parliament will also be deciding how long parliament terms are, whether it remains at three years or is pushed to four years like the United States.

Goldsmith said under the coalition agreement with the Act party, Government will introduce a bill but it remains to be seen if it would make it to referendum.

"There are good arguments either way for three- or four-year terms, certainly the focus at the moment is to make the most out of the three years we've got. [Four years in opposition] is certainly not an appealing prospect - I think that's something everyone has a view on. We’re going to introduce a bill and take it to a select committee and see how it goes."

Asked why not consider a five-year term, Goldsmith was open to the suggestion.

"Indeed, you could have that argument," he said.

"Ultimately it's the quality of the Government that really matters, rather than the length, but they're the sort of things we should work our way through."

Other proposed changes to electoral law include repealing the offence of "treating" voters with refreshments and entertainment and freezing the ratio of list seats to electoral seats, effectively capping the size of parliament.

Goldsmith said the number of MP's would slowly increase under current recommendations, which the Government doesn't want to happen right now.

"I didn't think there was much support for that and we're not keen on having more MPs over the next few years. "