William Shatner shares tip for staying youthful at 93

 "Star Trek" actor William Shatner, who celebrated his 93rd birthday on Friday, feels as young as ever.

Shatner's secret to staying young in his 90s is: "Just staying engaged in life, staying curious. But luck has a big impact on your health."

"Your life energy, your body's soul energy is a product of health," he tells People. "If you're sick, you can't be energetic. You're dying. So I've been lucky, I've been healthy my whole life."

William Shatner shares his biggest regret of Hollywood career: 'I failed miserably'

The actor, who starred in the original "Star Trek" show from 1966 to 1969, is proud of still being "energetic."

He told PEOPLE at the premiere of his documentary "You Can Call Me Bill" on Thursday that he largely credits his positive outlook to his "wife," Elizabeth Martin.

Shatner was married to Martin from 2001 until 2020, when their divorce was finalized. Reconciliation rumors began circulating after the former couple attended the Living Legends of Aviation Awards together in January 2023.

He told the outlet that he doesn't take birthdays too seriously and prefers to celebrate in a relaxed manner.

"Well, supposedly a birthday is a big day. I guess that's a reason to celebrate for someone outside of, 'Oh my God, 93,'" he said, "I'm not proud of it."

Ahead of his big birthday, Shatner shared the biggest regret of his long Hollywood career.

Placeholder Speaking candidly about his 1989 film, "Star Trek V: The Final Frontier," Shatner said the project was doomed from the start. He reprized the role of Captain James T. Kirk in the film, which he originally played in the TV series.

"I wish I had the support and courage to do the things I feel I need to do. My concept was, "'Star Trek' goes in search of God," and management said, 'Well, God. Who is? We'll alienate the unbelievers, so, no, we can't do God's work,'" he explained to The Hollywood Reporter.

"And then someone said, 'What about the aliens who think they're gods?' Then it was a series of my inability to deal with management and budget,” he said of his subsequent steps in making the film, in which he served as director. "I failed. In my mind, I failed miserably."

"When I'm asked, 'What do you regret most?' I regret that I could not be emotionally equipped to handle a big movie. So in the absence of my power, the vacuum of power was filled by those who did not make the decisions I would have taken," he lamented. .

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When it was released, the "Star Trek" film was criticized for its lack of execution and overall disappointment. Shatner said he takes all the blame, even if people question his budget or the support he receives.

"It's on me," he repeated, citing the mismanagement of his $30 million budget. "[In the final scene] I wanted the granite [rock creatures] to burst out of the mountain. The special effects guy said, 'I can make you a suit that burns on fire and has smoke.' I said, 'Great, how much will it cost?' He said, '$250,000 a suite.' 'Can you make 10 suits?' he said yes.''

"That's $2.5 million. You have a $30 million budget. Surely you want to spend [that]?" He remembered thinking. “Those are practical decisions.”

Shatner's plan did not come to fruition due to mechanical problems at the end of filming.

Despite memorable bumps in the road, Shatner has been successful both in front of and behind the camera.

"It's a privilege. It's a privilege to be healthy," he told Fox News Digital in June about his longevity in the entertainment industry. "I think that's the first thing...things have happened to me, but nothing has weakened over time. So having the life force within me, probably, mostly, that's what it's all about."