"It's so funny because I always feel like I just started out," Lopez told ET. "And when I think about all the years that have passed it's kind of like, 'Wow, that's how old I am? When did all of this happen?'"
Lopez also credits her 8-year-old twins, Max and Emme, as being partly responsible for her persistent youthfulness.
"Sleep is super important to me," she said. "I learned that when I hit the wall early in my career and got sick. I realized I have a limit. You will fall down at a certain point and mommies can't do that."
And nothing comes before J.Lo's mommy duties. The Shades of Blue star enjoyed some family time over the Christmas holiday, which included documenting the fabulous musical entrance of her mom, Guadalupe Rodriguez.