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Rick Springfield is proving age really may be just a number.

The 77-year-old rocker stunned fans with his remarkably fit physique while on tour, prompting social media users to marvel over his youthful appearance.

Fans flocked to social media to gush over the "Jessie's Girl" singer as a video of him performing in Las Vegas went viral over the weekend. In the video, Springfield plays the guitar and sings while shirtless on stage.

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Rick Springfield, photographed here on Aug. 21, stunned fans with his remarkably fit physique during a shirtless performance in Las Vegas. (Jason Kempin/Getty Images)

"That beautiful man ages backwards...," one user commented on Instagram.

"He must be doing something right," another added on X. "Still looks and sounds great and a full head of hair to boot. Good for him."

"If i look like that when I'm 77, i'm doing that too," one user said.

"77...Who's his chef, trainer and doctors? I'll buy whatever serum he's taking," one joked.

"77?! Holy Fountain of Youth!!!" another wrote.

Social media users praised Rick Springfield’s youthful appearance and asked about his fitness and wellness secrets. (Jason Kempin/Getty Images)

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Springfield has been working with his personal trainer for about two-and-a-half years, and the results speak for themselves.

His trainer explained to Men's Health that because Springfield’s career requires him to stay active and energetic onstage, their workouts focus heavily on athletic movement and conditioning to help build the stamina he needs to perform.

Rick Springfield’s personal trainer, Larry Willis, said their workouts focus on plyometrics, stair climbing and athletic conditioning to build stage stamina. (Jason Kempin/Getty Images)

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"We do a lot of plyometrics, we do a lot of stairclimber – which he hates," his trainer, Larry Willis, told the outlet.

Springfield first found success in Australia as a member of the band Zoot before pursuing a solo career and eventually relocating to the United States. His breakthrough came in the early 1980s when his album "Working Class Dog" produced "Jessie’s Girl," which reached No. 1 in the U.S. and earned him a Grammy for best male rock vocal performance.

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Rick Springfield rose to fame with his hit song "Jessie’s Girl" and also played Dr. Noah Drake on "General Hospital." (Scott Dudelson/Getty Images)

At roughly the same time, Springfield became a familiar face on television as Dr. Noah Drake on "General Hospital," a role he would return to several times over the decades.

His career has also included film roles, notably the 1984 musical drama "Hard to Hold" and the 2015 Meryl Streep movie "Ricki and the Flash."

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