Music mogul Cowell has previously admitted to undergoing Botox treatment and drinking smoothies to stave off the effects of ageing. Now Cowell, 52, has adopted the Hollywood fad for bottled oxygen in order to rejuvenate his skin and reduce stress. A source told the Sun newspaper: "Simon knows he's not getting any younger and is trying every trick to tackle it. "He says it helps him relax and keep the stress at bay. Cowell has previously described Botox as "no more unusual than toothpaste." He said in an interview: "Vain? Yeah, I am. But to be honest with you, I can't think of one person who is on TV who isn't vain. From: E!