Jamie McAllister, 19, was spotted near Milngavie, East Dun-bartonshire, yesterday afternoon after an agonising five-day search by his family, friends and police.
His dad Steven contacted the Evening Times as he went to see his son and thanked readers for their help in the search.
Steven said: "We are absolutely elated that Jamie has been found. We want to thank the readers of the Evening Times for their help."
Jamie's gran Ger-aldine McAllister, 61, added: "We've just received amazing news.
"He's been found. I can't think straight.
"We don't know the details, but I'm absolutely over the moon. My stomach's turning.
"I feel like we've got a second chance."
Jamie's disapp-earance prompted a massive appeal for information.
It is understood he was spotted by builders who recognised him from our reports.
He was said to be confused and suffering from exposure when he was found and he was taken to hospital by ambulance for treatment.
Jamie went missing on Monday, prompting his family to make an agonising appeal for information on his whereabouts.
The teenager, who is originally from Knightswood, Glasgow, was last seen at his flat in Rowan Road, in Cumbernauld on Monday afternoon.
He then sent a text message to his friend, at around 3am, and that was the last time his mobile phone was used.
He had recently decided he wanted to go to college to study Business Management.
A spokeswoman for Police Scotland said: "Jamie has been found and his family are being informed."