Academy Award-winner Julia Roberts says her choice not to have a face-lift may affect her career.

"By Hollywood standards, I guess I've already taken a big risk in not having had a face-lift," Roberts, who turned 47 Tuesday, told You, the Sunday supplement of the UK newspaper The Mail over the weekend. "But I've told Lancôme" -- for whose perfume La Vie Est Belle she is a brand ambassador -- "that I want to be an aging model -- so they have to keep me for at least five more years until I'm over 50."

Roberts, whose role as a beleaguered grown daughter in last year's "August: Osage County" earned her a fourth Academy Award nomination, said she attributes her youthful look not to cosmetic surgery but to a philosophy of "non-grasping, non-hoarding, cleaning out your closet, dusting out your mind and letting go of the things that weigh you down mentally and emotionally."

And she added: "There's a lightness to my life now -- an airy quality of not taking things too seriously. That's happiness."

Her words echoed those of fellow Oscar-winner Renée Zellweger, 45, whose new appearance at an awards ceremony on Oct. 20 sparked widespread speculation of plastic surgery.

"I did work that allows for being still, making a home, loving someone, learning new things, growing as a creative person and finally growing into myself," Zellweger said last week in response to commentary that spread from the Internet to TV talk shows. "Perhaps I look different. Who doesn't as they get older?! Ha. But I am different. I'm happy."