Liberal candidate Wyatt Roy is on track to win the Queensland seat of Longman.
The 20-year-old is holding 52.39 per cent of the vote on a two-party preferred basis against Labor member Jon Sullivan at 47.61 per cent, according to preliminary results.
But while he is facing a 4.26 per cent swing in his favour, Mr Roy will not claim victory in the outer northern Brisbane seat until much later in the evening.
"We still do have a long night ahead of us," Mr Roy told the Nine Network.
"There's still a lot of votes to be counted."
Former Liberal treasurer Peter Costello said on the Nine Network Mr Roy is on track to be leader of the party by 2035.
"I'll have a chat to Peter about that later," Mr Roy joked.
He will become the nation's youngest ever federal Member of Parliament.
It is the first time Mr Roy has even voted in a federal election.
"Naturally, anybody who goes through a campaign understands that it's both gruelling and it's personally demanding, and I look forward to it being over," he told AAP while casting his vote at a Caboolture polling booth today.
Despite the question mark that lingered over Mr Roy's age, he ran a clinical grass roots campaign and used the media attention to his advantage by highlighting local issues every chance he got.
He will take the seat from Labor's Jon Sullivan, who had to apologise over a gaffe at a public forum recently: he accused a father of not taking sufficient action, after being told the family had waited two years for specialist medical help.
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