(CNN) Forget marriage counseling or couples therapy. Harrison Ford has the secret to a long-lasting marriage and it's quite simple.

"Don't talk. Nod your head," the 77-year-old actor joked in an interview with entertainment magazine Parade.

Ford and his wife, Calista Flockhart, 55, are nearing their 10-year wedding anniversary, but they've been together for nearly 18 years -- a milestone that's hard to see among Hollywood couples.

Ford and Flockhart first met at the 2002 Golden Globes and wed eight years later. Ford has four children from two previous marriages and Flockhart has an adopted son.

And while some might gawk at their age difference of 22 years, Flockhart assured in a 2017 interview with Closer Weekly that it was always a "non-issue" in their relationship.

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