Tim McGraw is celebrating his lengthy, 27-year marriage to his wife Faith Hill – and certainly hasn’t shied away from revealing the secrets of their success!

The country music icon cheekily told Entertainment Tonight Canada: “I don’t know if there’s a key. We always say we’re 27 years coming up, it’s like 96 in show business. It’s almost like dog years.”

McGraw, 55, and Hill, 55, first met at a Nashville gig in 1994. At that time, Hill was engaged and McGraw was dating, so nothing came of it.

Hill ended up serving as McGraw’s opening act for his 1996 ‘Spontaneous Combustion’ tour, and the pair were married later that year.

Since then, the couple has welcomed three daughters – Gracie, 26; Maggie, 25; and Audrey, 21.

Speaking to Entertainment Tonight Canada, McGraw said he might not have an exact recipe for a successful marriage, but did admit he knows how to make his wife happy after almost 30 years together.

In fact, during his interview he revealed that the pair made one sweet promise to each other early on in their relationship, which he feels has enabled his marriage to be as long-lasting as it is.

“We just made a commitment early on, when we first decided we were getting married and having kids, that we wouldn’t just walk out the door when problems arose,” he revealed.

McGraw was also candid about how his family is always “brutally honest” with each other, highlighting that honesty is an important quality to have in his household.

“Faith and I were going to raise our girls to be strong, independent and fierce and have their own minds and have their own opinions,” he added. “And sometimes I go, ‘Dang, do we want them to be that independent and strong?’ But yeah, we’re so proud of them.”

McGraw – who has dabbled in acting and even appeared in big name movies like ‘The Blind Side‘ with Sandra Bullock – has also spoken candidly in the past about his 15-year struggle with sobriety and how Hill has been there by his side through all of it.

“She’s always been my rock. She’s my rock in everything that I do. I don’t think I could stand up straight without leaning on her in everything that I do,” McGraw previously said.