Fresh after his top-10 NBA Draft pick, Australia's Thon Maker can't seem to shake off conspiracies surrounding his actual age.

Key points: Sudan-born Thon Maker picked at number 10 by Bucks at NBA Draft

Sudan-born Thon Maker picked at number 10 by Bucks at NBA Draft Questions over his age after images of Aranmore Catholic College 2010 yearbook posted on Reddit

Questions over his age after images of Aranmore Catholic College 2010 yearbook posted on Reddit Bucks, Maker's sister insist he is 19-years old

Maker surprised many as the Sudan-born, Perth-raised power forward became the first player in more than 10 years to jump straight from high-school basketball to the NBA.

But questions over his age have been floating around NBA circles for some time, leaving a number of NBA teams to avoid him entirely in their plans leading up to the NBA Draft.

Milwaukee took the punt on Maker, who grew up in Perth before playing high-school basketball in the United States and Canada.

But his complex past - he fled Sudan to Uganda before making his way to Perth - invited many sceptical eyes to scour his records, with budding online investigators casting doubt on his age of 19 years.

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Photos emerged on Reddit of a 2010 yearbook from Aranmore Catholic College, which showed Maker among a 'Graduating Class of 2010'. With students normally graduating at ages of 17 and 18, that would allegedly put Maker's age at 23 or 24.

The rumours made it into America's mainstream media, with headlines like 'Do You Know How Old Thon Maker Is? If So, Some NBA Teams Could Use Your Help' doing the rounds, prompting Maker to repeatedly deny the allegations in a number of interviews.

In response to the rumours, one of Maker's former coaches at the Athlete Institute Basketball Academy in Ontario, Sky Smith, produced a photo of Maker's expired passport that lists Maker's birthday as February 25, 1997.

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"It did get to me in terms of me hearing about it, but it didn't get to me personally because if it were true, I'd probably be like sideways about it, but it's not true, so I'm comfortable," Maker told The Boston Globe.

"I'm not angry or anything. I've got to learn what I can say and what I can't say now."

Aranmore Catholic College declined to answer questions over Maker's age, citing privacy issues.

Bucks' club administrator Anna Pazanin said Milwaukee sighted Maker's passport when he was registered with Basketball NSW in 2011.

"I saw his passport, I had the passport in my hand," Pazanin said.

Thon Maker with NBA Commissioner Adam Silver after being drafted 10th by the Bucks. ( Getty Images: Mike Stobe )

"We need some form of ID and his passport was produced as that form of ID, it had his name date of birth and picture."

His sister Ajak has also dismissed the rumours, maintaining her brother was 19-years-old. And despite the queries, the Bucks are adamant he was the right choice.

Also on the front foot for Maker's case is his Draft Express weight measurements. In 2013, Maker's weight is listed as 191 pounds (86 kg), before jumping to 219 pounds (99 kg) in 2015, suggesting a typical growth spurt for someone in their mid-to-late teens.

Thon Maker's pre-Draft measurements Year Source Weight 2013 Nike Elite 100 191 lbs 2013 LeBron James Camp 194 lbs 2015 Hoop Summit 218 lbs 2015 Bio-Steel All-Canadian Game 219 lbs 2016 Bio-Steel All-Canadian Game 225 lbs 2016 NBA Draft Combine 216 lbs

The lanky 7'1" player, who has a 222 cm wingspan, burst on to the basketball scene when a mix tape of his abilities went viral on YouTube.

His athleticism, length and quickness offer him the tools to be a threat on both ends of the court.

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