Rick Springfield, 77, shocks fans with ripped physique during shirtless performance

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.

LENNY KRAVITZ REVEALS THE SIMPLE TEST HE USES TO KNOW IF HE'S STILL FIT AT 62 "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.

GET ENTERTAINMENT SCOOP DELIVERED RIGHT TO YOUR EMAIL BY CLICKING HERE 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.

LIKE WHAT YOU'RE READING? CLICK HERE FOR MORE ENTERTAINMENT NEWS "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.