United Kingdom, Nov. 27 -- Simon Cowell says he stays young by washing his own blood to battle the effects of aging.

The 66-year-old star - who has 11-year-old son Eric with fiancee Lauren Silverman - has opened up on the unusual practice he has embraced as he tries to look after his body as he gets older.

He told the Rolling Stone Music Now podcast: "I go to this wellness clinic where they actually take your blood, they rinse it, they filter it, they put it back into your body."

Simon explained that he undergoes tests at the clinic, where they "tell you your age".

He added: "You do all these tests and they tell you your age - so I've actually aged backwards by eating better, more exercise, less stress, certain supplements.

"My brain...