"Marriage is not a sprint," says Jenny Triplett. "It's a marathon." She says that couples need to realize that they'll be in their relationship for the long haul.
Kayla DeLano got married when she was 19. She is now 34 years old, and still married to Michael, 38. They live in Long Beach, Calif., with their 11-year-old son.
In addition to honesty, communication and kindness, she says spending time with her husband, despite work demands, is their key to longevity. So is understanding that partners evolve during the course of a marriage.
"I think you need to be realistic about the fact that you and your spouse will both change," she says. "You can't say that the person you are right now is going to be the same person that you're going to be in five years."
She says their secret is learning to ebb and flow together, rather than apart. When her husband wanted to shed some weight he had gained, he turned to Kayla. A personal trainer, she helped him lose 70 pounds over two years. "It's pretty awesome," she says.
They started biking together. Now, they play a range of sports, from running relays, to trampoline jumping. They stay active, and above all, have fun.
"When we are together, we're really together," she says. "We really focus on each other, and try to tune everything else out."