Actress Cameron Diaz has revealed that she didn't think she would get married after turning 40.The "Other Woman" actress, 43, who married Good Charlotte rocker Benji Madden, 37, last year, said that was the "biggest thing" she has done in her 40s, reports usmagazine.com. "I got married last year. That was the biggest thing I've done in my 40s, and it opened me up in different ways. It's pretty awesome. I didn't think it was something I would do, and I don't know if I would have done it if I hadn't met my husband. It was a surprise," Diaz told Harper's Bazaar magazine. Diaz admitted she believes in "dressing your age" though her perception of age is slightly different. "Even when you are a certain age, it's all a matter of how you present yourself, how old your spirit is, and where you are in your life," she said."Some 50-year-olds are still 35. It's about expression and what they can pull off," Diaz added.