Cameron Diaz, 43, says goodbye to tube tops

Cameron Diaz Says Goodbye to Tube Tops

Cameron Diaz looks like she hasn't aged a day since "There's Something About Mary" in 1998 -- but the 43-year-old actress says it's time to start acting her age.

The first thing to go? Her signature tube tops.

"I'm definitely not doing tube tops. No way," she told Harper's Bazaar when asked about the one thing she wouldn't dare wear at 43.

The star, who believes in "dressing your age," added that "everybody's age is different."

"It's all a matter of how you present yourself, how old your spirit is, and where you are in your life. Some 50-year-olds are still 35. It's about expression and what they can pull off," she said.

See Cameron through the years:

Cameron Diaz through the years
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Cameron Diaz, 43, says goodbye to tube tops
BEVERLY HILLS, CA - JULY 28: Actress Cameron Diaz attends 'The Mask' Beverly Hills Premiere on July 28, 1994 at the Academy Theatre in Beverly Hills, California. (Photo by Ron Galella, Ltd./WireImage)
WESTWOOD, CA - JUNE 9: Actress Cameron Diaz attends the 'Batman Forever' Westwood Premiere on June 9, 1995 at Mann Village Theatre in Westwood, California. (Photo by Ron Galella, Ltd./WireImage)
Keanu Reeves and Cameron Diaz having beers in a scene from the film 'Feeling Minnesota', 1996. (Photo by Fine Line Features/Getty Images)
Cameron Diaz in a scene from the film 'Head Above Water', 1996. (Photo by New Line Cinema/Getty Images)
Cameron Diaz (Photo by Jim Smeal/WireImage)
Cameron Diaz during ''My Best Friend's Wedding'' New York City Premiere Party at Plaza Hotel in New York City, New York, United States. (Photo by Ke.Mazur/WireImage)
NEW YORK CITY - OCTOBER 3: Actress Cameron Diaz attends 'A Life Less Ordinary' New York City Premiere on October 3, 1997 at Village East Cinemas in New York City. (Photo by Ron Galella, Ltd./WireImage)
Cameron Diaz & Matt Dillon at the Mann Village Theatre in Westwood, California (Photo by Steve Granitz/WireImage)
Cameron Diaz at premiere of 'Very Bad Things,' New York, November 16, 1998. (Photo by Steve Eichner/Getty Images)
LOS ANGELES, CA - JANUARY 27: Benji Madden (L) and Cameron Diaz attend a basketball game between the Washington Wizards and the Los Angeles Lakers at Staples Center on January 27, 2015 in Los Angeles, California. (Photo by Noel Vasquez/GC Images)

While many people would kill for Diaz's long, lean body, she admits it's getting harder to maintain as she gets older.

"It doesn't react the same way that it used to. I don't get the results that I used to as easily as I once did ... If I slack off, things don't come back so easily. I have to be committed."

The actress is sharing all of her tips in her new book, "The Longevity Book." A follow-up to her previous No. 1 bestseller, "The Body Book," the educational page-turner taps into scientific research to explore how the female body ages -- and how women can maintain their "optimal health" as they age.

RELATED: Cameron Diaz's exes

Cameron Diaz's Exes
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Cameron Diaz, 43, says goodbye to tube tops
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