“Sex and money help prolong life,” he told the daily newspaper Streats.

Attending an anti-ageing medical conference in Singapore, Klatz, 48, said, “Anti-ageing is 80 per cent personal behavior and only 20 per cent medicinal.”

People should monitor any changes in their bodies so that illnesses can be detected early, he advised.

Eat well, take nutritional supplements, drink red wine moderately and don’t smoke, he added.

“It’s no use to live to 100 or more if you are a burden to your family and society,” Klatz said. “It should be a long and healthy, quality life.”

Adding to his confidence that life can extend to 150 is research in the ageing process.

“Doctors and scientists used to believe that ageing was inevitable and irreversible, so they never studied it,” Klatz said. Now, with more research, he is hopeful there will be more breakthroughs, he added.