OWN
03/14/2014 09:50 am ET

Cameron Diaz Says Life Begins At Age 40 (VIDEO)

While some people dread their upcoming birthday, Cameron Diaz had a different reaction to turning 40. "I was so excited," she tells Oprah in the above clip from "Oprah Prime."

The actress says she woke up on her birthday and thought, "Oh, now life begins. Oh, this is it! This is the coolest thing ever."

In the upcoming episode, Diaz, age 41, and Oprah, 60, have an open conversation about health, beauty and aging gracefully. "We all look in the mirror and start to see those changes and you're like, 'What is that?'" Diaz says.

But Diaz says she's embraced the aging process. "It's a gradual thing and you get to learn about yourself and see yourself and start to live with who you are as you go," she says.

"Oprah Prime" airs Sunday at 9 p.m. ET on OWN.

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