Nina Cash and her husband Aaron were enjoying a beach getaway in Australia during the New Year when he decided to take some sizzling shots of her in a bikini.

But these were no ordinary photos.

Nina Cash walking on the beach in a bikini

Nina Cash is a proud mother of three daughters. (Aaron Cash)

"I was joking with my husband and daughter — I said, ‘I’m going to do it when I retire,'" the mother of three told Fox News Digital about trying out for Sports Illustrated Swimsuit’s annual casting call. "It was January 2nd in Australia, which meant it was January 1st in America… and I hadn’t worn a bikini in forever. So, I wore a bikini, and my husband took some candid shots. And he said, ‘Honey, you should apply.’ And I said, ‘Oh, I think it’s too late. I think [it was over] in October. So he went online and said, ‘The deadline is January 1st! Let’s do it!’"

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Nina Cash wearing a bikini on the beach

Nina Cash said her husband, Aaron Cash, encouraged her to try out for this year's SI Swim Search. (Aaron Cash)

"So, I cobbled together footage and this candid shot that he had," Cash shared. "And then I did a really quick video and I spliced it together. I sent it in and thought, ‘Wouldn’t it be a miracle and super cool if I got this?’"

Nina Cash with her arms out wearing a bikini at the beach

Nina Cash said her decision to try out for the SI Swim Search was made at the last minute. (Aaron Cash)

Cash, a retired university associate dean from California, is now a top 12 finalist for the 2023 SI Swim Search. SI Swimsuit’s annual casting call, which receives thousands of submissions from hopeful models, aims to discover its newest star.

"My reaction was utter shock," she said about learning the news. "I’m thrilled, but shocked that I’ve made it this far — but happily shocked. And I’m taking it all in. I feel like a 5-year-old on the night before Christmas with all the wonderful anticipation, the butterflies in my stomach, the nervousness. It’s such a great feeling, and I’m embracing it."

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Cash, who joked she was a "senior citizen," said she was inspired by Kathy Jacobs, who became "the oldest rookie" at age 57 in 2021.

"There is no expiration date," Cash explained. "You can keep going and going… You can smooth over those road bumps. And that’s what I want to do. It’s never too late. It’s always right timing. I don’t think I would’ve been prepared to do this if I were younger. I think I am the best version of myself right now because I lived life. People talk about laugh lines — I have life lines. I’m not going to get rid of those life lines because that means I have lived life, and I’ve also been a lifeline to other people because of my age and my wisdom, my skills and my abilities. I have lived that. So I wouldn’t trade it for the world."

A close-up of Nina Cash looking directly at the camera wearing a black blouse

Nina Cash was a regular dancer on Dick Clark’s "American Bandstand" in the 1980s. (Michael Higgins)

"I don’t want to go back to being 25 years old," she insisted. "I don’t want to go back to being a teenager. Even in my thirties. I think beauty does blossom with age. I’m 56, and I feel like I’m blossoming more than I ever could in my twenties or thirties or even forties."

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Nina Cash wearing an orange and black swimsuit

Nina Cash said she is enjoying her "encore" as a model at age 56. (Michael Higgins)

The original swimsuit issue ran in 1964. It has since been a launching pad for models like Kathy Ireland, Christie Brinkley, Elle Macpherson, Kate Upton and Ashley Graham.

Cash said she’s been curious about modeling but was wary of what her colleagues would have thought of her.

"When I was an associate dean working in education, I never talked about wanting to model or anything like that," said Cash. "Because for whatever reason, if some people found out, [they would] see me in a different light. It’s like, you can’t be pretty smart — you can’t be pretty and smart. You can’t be accomplished and pretty because for some reason, you can only be one or the other, right? And for me, it’s like, why not embrace all of you? Embrace what you’ve done in the past. Embrace your experiences and show that."

Nina Cash in her graduate cap and gown

"I earned my bachelor’s and master’s degrees 20 and 30 years, respectively, after high school," said Nina Cash. "And at 55 years old, I earned my doctorate." (Aaron Cash)

Cash said her husband is elated that she made the cut.

"I have such a wonderful husband," she gushed. "He’s my biggest and loudest cheerleader… I wanted to apply the following year because I had just retired. So I had been thinking about it… He’s over the moon. And my daughters are over the moon for me and excited. They’re like, ‘Mama, slay the gray! You’re 56 and in the mix — slay the gray!'"

There’s another man who has also been on Cash’s mind recently — her late father. She said growing up in a Filipino, Catholic and military family had a profound influence on how she sees the world.

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A close-up of Nina Cash looking away from the camera in a glamour shot

Nina Cash said her daughters have been encouraging her to "slay the gray." (Michael Higgins)

"My dad, even though he saw a lot of action, was the kindest, most generous, warm, forgiving, welcoming human being," she said. "Prior to WWII, sadly my dad had to fight during the Japanese and Philippines conflict… This was probably when he was 16 or 17 years old… He was at a camp [in the jungle] when one of his officers called him to the hut and said, ‘Francisco, you have to execute this Japanese soldier.’ They just got a prisoner of war. And my dad’s a young kid. The officer left, and my dad looked at this Japanese soldier who was the same age as [him]. And my dad couldn’t kill him because it wasn’t like they were fighting. He was just there."

Nina Cash wearing a light blue and white pants with a matching hat on a light blue bike

Nina Cash said she is grateful for her upbringing. (Paige Craig)

"My dad let the… Japanese soldier go," she continued. "And then my dad just shot in the air. Fast-forward, I think it was two and a half, three weeks later, my dad and three of his friends get captured by the Japanese. They’re lined up to be executed. And who comes out to execute them? The person that my dad let go. So that person let my dad go. My dad starts running, thinking that his friends are going to run after him. But no. The guy let my dad go, but he shot my father’s friends.

"I’m like, ‘What did my dad go through?’… I cannot complain about my life whatsoever. So I look at things in a very optimistic way all the time. I’m a can-do person. You very rarely hear me say, ‘No, it can’t be done.’… I have to look at my father and say his life experience was super dramatic. And if that didn’t get to him, by God, nothing’s going to get to me. I have to say, for lack of a better term, I’ve been privileged for the way I grew up with my family."

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Nina Cashs father Francisco smiling next to his granddaugher

Nina Cash said she is "the proud daughter of a veteran who served in three wars." The patriarch is seen here with his granddaughter. (Nina Cash)

Cash is grateful that over the years, SI Swimsuit has celebrated women with various life experiences that have shaped them. Today, she hopes her story will inspire others that it’s never too late to "have an encore."

Nina Cash in a cut-out white one-piece swimsuit and nude heels

Nina Cash stressed it is never too late to pursue your dreams, no matter your age. (Michael Higgins)

"I’ve got gray hair, I’m diabetic, I’m a retired person, I had a career, [but] I didn’t give up on my dream," said Cash. "It’s never too late. It’s always the right timing. I hope other women can see their reflections in me. I hope my hair, my eyes, my education, my struggles, whatever, will spark something in them that they don’t give up. I’m the best version right now of me that I could ever be."

The Associated Press contributed to this report.