Sam Woodhead will be taken to Longreach Base Hospital for a medical assessment, Queensland Police said.
The teenager's sister wrote on Facebook: "We have been told that they have found Sam!! We have no information on his condition or where he was found yet, so keep your fingers crossed."
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The couple made the announcement last night in Los Angeles at the premiere of his latest film Doctor Strange.
Mostly dry tonight with some clear periods leading to chilly temperatures rurally.
The historic Schiaparelli lander appears to have been smashed after crash-landing onto the red planet, the European Space Agency said.