WATCH: Cameron Diaz Talks Aging, Happiness, and the ‘Worst Thing About Being Married’

Cameron Diaz also revealed her super cute nickname for Benji Madden that’ll make your heart swell.

The Longevity Book author opened up to Ellen Degeneres about her marriage to the Good Charlotte guitarist, as well as her new book about happiness, aging, and of course longevity.

On how her marriage brings her happiness and therefore longevity, the 43-year-old commented:

Happiness actually has shown that when we’re happy we actually live longer. When we accept that we’re aging we live longer. And being that our relationships are very, very important any kind of relationship it doesn’t just have to be a marriage. It has to be basically think of it as a purpose for living. Even if you’re just engaged in something you really think is important. But I do think that marriage my experience with it and I know that you have felt the same way. When you can grow with someone it’s very important.

As for her favorite (and least favorite) things about being married, Diaz remarked that it had to do with learning the good and the bad things about herself:

Someone asked me, what’s your favorite thing about being married? And I was like, well I just learned so much about myself. I didn’t know these things and I was like I would have never known them if I didn’t meet my husband who helped me. And they’re like what’s the worst think about being married. Well, I learned all these things about myself that I wish I never learned about myself and I wouldn’t have known them if I didn’t get married.  You know so it’s like this double-edged sword. But I’m just so grateful for it because I couldn’t do it without my husband and I couldn’t do it with anybody else except for him.

Find out Diaz’s cute nickname for Madden, as well as what she would bring to a desert island in the video above.

Order The Longevity Book here.