He has revealed that he is in shock having been made to live a false life from his real destiny after he was actually born to a rich family but made to live a life of penury in a Japanese suburb.
He has told of his shock at learning the truth of how different his life could have been.
After winning a lawsuit against the hospital that mistakenly cast him from a wealthy family into a life of poverty, the man said: “I’ve wondered how on earth could this happen.
“I couldn’t believe it. To be honest, I didn’t want to accept it.
“I might have had a different life. I want (the hospital) to roll back the clock to the day I was born,” he told Japanese media.
A Tokyo district court this week ordered the hospital to pay 38 million yen (£227,600) in damages over its 1953 blunder which saw the man switched with another baby boy who was delivered 13 minutes later.
The court ruled that 32 million yen (£191,780) should go to the man and the rest to his three biological brothers.
It is not clear if the hospital, which has not been named by Japanese media and has not commented on the bizarre case, will appeal.
The man, an unmarried truck driver, would have grown up as the eldest of four brothers in a wealthy family where siblings enjoyed a lavish lifestyle including private tutors.
Instead, he was raised on benefits by his non-biological mother who also supported older siblings after her husband passed away when he was two.
The family lived in a one-room apartment with a radio, one of their few luxuries, according to the man who studied at night school while working in a factory.
The man has been helping take care of his non-biological brothers, one of whom suffered a stroke.
The decades-old mistake was uncovered when the wealthy family’s three younger brothers had DNA testing done on their oldest sibling – who looked nothing like them – after their parents died.
They checked the hospital records and confirmed the identity of their biological eldest brother last year.
The man switched at birth said he cried daily for several months after learning the truth.
“As I saw pictures of my (biological) parents, I wanted to see them alive. I couldn’t hold back tears for months every time I saw their pictures.”
One of my brothers “told me that we will have 20 more years to live so we should make up for lost time”, he added.
“I was happy to hear that and I want to do it.”
Judge Masatoshi Miyasaka cut the size of the award but said he recognised the man had lost a chance of higher education and had suffered emotional pain.
The mothers in both families had seemingly suspected they had been raising the wrong babies.
“I think my foster mother might have sensed it,” the man said, noting physical differences from the siblings he grew up with.
His real brothers remember their mother saying her first baby came back from his first bath in hospital wearing the wrong clothes.