Julianne Moore joined the 'Hunger Games' franchise for her children

NEW YORK, Oct. 29 (UPI) -- Julianne Moore revealed in the November issue of More magazine that her kids played a part in her joining the cast of the Hunger Games saga.

The 53-year-old actress is set to play District 13's President Coin in the last two installments of the films, Mockingjay Part 1 and Part 2 and she says her participation in the movies meant a great deal to her son Caleb, 16, and daughter Liv, 12.

"Most of the films I make are not for kids," the actress said. "My son was in line for the midnight show when 'The Hunger Games' first came out. They both loved the books. For them, my being in Mockingjay was fairly meaningful."

Asked about ageism in Hollywood and the roles she usually plays now that she's no longer in her twenties, Moore said she's more comfortable in her own skin now than she used to be.

"When you're starting out in this business, you feel like you're not in charge, that you're still looking to the world for a kind of validation. But as you get older, you realize that direction comes from yourself, from your own desires and responsibilities.

"You choose your work. You choose your life," she continued. "That's where your power comes from – and that's a great feeling."

In addition to her role in the Mockingjay films, Moore will next star in Maps to the Stars, Still Alice, Seventh Son, Freeheld and Maggie's Plan in 2015.

The new issue of More magazine is out now.