Pierce Brosnan reveals the secret behind his great head of hair and aging well

Pierce Brosnan may be unlocking the secret to why Irish men seem to possess enviable mops of hair.

“I don’t know,” he told Page Six exclusively at the premiere of “The Thursday Murder Club” on (naturally) Thursday evening in New York when asked his theories.

“It’s all in the hair, the old Celtic hair,” he shared before noting that his father, “Dear Tom…had good hair.”

The “Mamma Mia!” star opined that perhaps “potatoes, butter,” or “the Guinness” was responsible for the lack of baldness among older Irish gents.

And when we told Brosnan he seems to be aging like fine wine, the actor replied, “I’m doing my best!”

The actor, 72, will soon be seen in the charming murder mystery on Netflix opposite Ben Kingsley and Helen Mirren, in which he plays a slightly rough-around-the-edges former union activist who helps uncover a cold-case murder. The film is based on a book by Richard Osman.

Brosnan shared that it’s not the first time he’s played an unpolished character.

“I’ve done rough-around-the-edges before,” the “James Bond” alum said before noting that he has been “so entrenched in the world of the sophisticated man and Mr. Slick and Mr. Elegance, you know, sometimes you paint yourself into a corner with your own…you get hoisted by your own canard so to speak!”

Not that Brosnan is complaining.

“It’s paid the rent over the years!” he sagely noted before adding that it’s “very exciting” and “exhilarating” to “play in ‘Thursday Murder Club,’ to play in ‘Mobland.’”

Brosnan has been winning raves for his role as a nefarious crime boss in the Paramount series and it hasn’t escaped his attention.

“I’ve been hearing that yes, for sure,” he acknowledged. “One can feel the wave, and you celebrate it and give thanks, doesn’t happen that often!”

Brosnan attended the premiere with his son, Dylan.