‘Miami Vice’s’ Don Johnson’s secret to a youthful 74 is being happily married: ‘A bad marriage will age you’

Don Johnson has an easy secret to staying handsome and energetic at 74.

"Marry right!" he told People magazine, adding, "A bad marriage will age you."

The "Miami Vice" star has been married to his wife, Kelley Phleger, since 1999. The couple share three children: Atherton Grace, Jasper and Deacon.

In another interview with People earlier this month, Johnson said the keys to his 25-year marriage to Phleger are simple.

DON JOHNSON SAYS THREE THINGS ARE 'KEY' TO HIS LONG-LASTING MARRIAGE

"Oh, we are just so in tune with each other that there's an unspoken, like, trust and kindness and respect with us. And those are the keys," he told the outlet.

In an interview with Parade last year, Johnson called her "an amazing woman."

"A bad marriage will age you."

— Don Johnson

"Obviously, she’s a saint. I was with Bob Dylan one time, and I was having relationship issues, and Bob looks up at me and goes, ‘Well, see, love is about kindness, trust and respect, isn’t it?’ And that’s the embodiment of Kelley," Johnson said about what makes Phleger perfect for him. "It’s kindness, trust and respect, and we have that with each other. We’re lovers and friends and it’s fun. She’s an amazing woman."

He is also father to a son from his relationship with Patti D’Arbanville, Jesse Wayne Johnson, and daughter Dakota Johnson, from his marriage to Melanie Griffith.

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Johnson and Griffith married when she was 18 in 1976, after first meeting when she was 14. They divorced in November that same year.

They married again in 1989 and remained together until 1996. Johnson also adopted Griffith’s son from her relationship with actor Steven Bauer, Alexander Bauer, per People.

Fox News Digital reached out to representatives for Griffith for comment on Johnson's take on "a bad marriage."

Being a dad is another one of Johnson’s secrets to looking and feeling young.

"You have to exercise, and do it a lot," he told the outlet. "How do you think I got six kids?" adding jokingly, "That I know of, anyway!"

Johnson’s youthful energy is being put to work, with headlining two projects, Netflix’s "Rebel Ridge" and the new Hulu series "Doctor Odyssey."

Earlier this month, Johnson reflected on the ups and downs of fame during his career-making success on "Miami Vice."

"For a long time, I couldn’t even go anywhere," he told People. 

He continued, "I had to isolate. The [women] know where you are. We had security 24/7."

The intense fandom reminded him of what Elvis Presley must have gone through at the height of his fame.