Tim McGraw and Faith Hill are still going strong after 21 years and many, many changes, and in a new interview, the country superstars reveal what keeps their marriage happy after all these years.

McGraw and Hill were both young rising country stars when they wed in 1996, and over the subsequent two decades-plus they have weathered many changes, including raising three daughters, career highs and lows, McGraw's drinking and decision to stop and much more. The couple released their first-ever albums of duets, The Rest of Our Lives, in 2017, and they tell People that they have a few simple rules for keeping their marriage strong and happy.

Though they have spent much of the last year touring together on their most recent Soul2Soul Tour, the couple still set aside special time for date nights. They recently traveled to New York City to see Springsteen on Broadway, which McGraw calls "the most incredible thing I’ve ever seen. Watching him and [wife] Patti [Scialfa] together was magical."

They also make sure to get some time away from each other, setting aside time for their personal interests and even maintaining separate dressing rooms while they're on the road.

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"We both have our daily routines and we have our own dressing rooms," Hill affirms. "We each have our own space to retreat to so we do get time to ourselves."

Shared faith is the final key to a long and lasting relationship, Hill says. The couple have one ritual on tour that has not changed over the years.

“Tim and I share a quick quiet moment together before hitting the stage,” she shares. “Always praying.”

McGraw and Hill's People cover story is on newsstands now.

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