65,000 young Australians have been added to the Australian Electoral Roll in anticipation of the same-sex marriage vote.

Australians had until August 24 to sign up to the electoral roll to be eligible to participate in the upcoming ‘Australian Marriage Law Postal Survey’.

In the two weeks leading up to this date, 98,000 Australians enrolled to vote, with nearly 70 per cent of those being young people aged 18 to 24.

The final day before the cut off was the busiest day of the whole two week period, as people tried to quickly sign up before it was too late.

More than 16 million Australians will receive a ballot in the next few weeks, with the country now having the largest electoral roll since federation.

Many Twitter users are suggesting the significant spike in young people on the electoral roll will be problematic to the Liberal National Party and Turnbull Government at next election.

https://twitter.com/BigVic_AFL/status/900959310905090049

https://twitter.com/MorphyMagic/status/899914336784732160

The Australian Electoral Commission (AEC) processed over 930,000 enrolment transactions in total, including detail updates such as change of address.

This is nearly 250, 000 more transactions than in the weeks leading up to the last federal election.

“Over 3.3 million people visited the AEC website in the two weeks leading up to the close of rolls compared to an average fortnight of around 90,000 visitors,” said Electoral Commissioner Tom Rogers.

The High Court gave the survey the go ahead September 7, following a challenge on whether the government has the power to spend money on a postal vote.

But despite two challenges being presented before the court, money was already being spent.

“Prior to the High Court decision, approximately $8 million will have been spent on advertising production and placement, with other costs related to updating the electoral roll, operating the information line, establishing IT and security protection, survey operations, and materials printing not yet finalised,” an ABS spokesperson told news.com.au.

The whole survey is expected to cost $122 million.

Australia Post is sending out 600,000 survey forms per day from September 12, with rural and remote areas being prioritised.

The survey packages are already being slammed online for privacy concerns.

A photo initially shared on Facebook revealed that shining a torch light over the envelope provided, made the yes or no vote visible.

“So we have wasted $122 million on a survey where a torch can reveal the answer through the reply envelope it came with,” a user wrote.

“So any postal worker with a vendetta against the opposing side can go through and remove votes as they see fit. (Or workmate if you post from work). Bravo government.”

The ABC conducted their own test, revealing the concern was real.

Ensure you are voting correctly by reading our guide here.