Mohib Ullah was last seen walking out of an Asda in Charlton, southeast London, at about 7.15pm on Tuesday evening.
He was found after being spotted by a member of the public.
In a tweet the Met Police said: "Mohib has been located safe and well. Thank you for all your RT's. An eagle eyed member of the public spotted him in Belvedere.
"Thank you @SkyNews for featuring our appeal on your main news page."