Robbie Williams `had testosterone levels of a 100-year-old man`

The 37-year-old singer decided to take drastic action after tests revealed that he had the same amount of the sex hormone - which boosts sex drive and is vital for good health - as a 100-year-old man.

He had originally been considering using human growth hormone (HGH), which is popular in Hollywood with middle-aged men who want to look younger, but soon changed his mind when he was delivered the shock diagnosis.

He told Esquire magazine, 'It has changed my life. I feel I'm getting a second wind.

'To cut a long story short I went to get some HGH. It's what all the old fellas are on out there in LA that's making them look 40 instead of 60.

'It's improving their health, their memory, their hair, skin.

'Could give you cancer. I weighed that up. Thought I'd have it anyway. Went to see a Hollywood doctor. Had my blood tests. Went back. He said, 'You don't need HGH. You've got the testosterone of a 100-year-old man.'

'And then everything made sense. It was kind of an epiphany that day.'