By Meghan Overdeep
Updated Mar 18, 2016 @ 10:30 am
Actor Rob Lowe attends the DirecTV Super Saturday Night at Pier 70 on February 6, 2016 in San Francisco, California.
Credit: C Flanigan/Getty Images

Rob Lowe's still got it! Reminding us once again that age ain't nothin' but a number, The Grinder star celebrated his 52nd birthday on Thursday by sharing a shirtless selfie with his doppelganger son, John. Wouldn't you?

"Celebrating my #birthday with a #workout and @johnnylowe. Whatever your age, be your best! #men #results @profile4men" the ageless hunk captioned the snap of himself and John, 20, showing off their tanned and toned physiques. Lowe's eldest son (and his favorite workout partner) is home from Stanford University for spring break.

Lowe works hard to stay in shape and look his best—but that doesn't always mean hitting the gym.

"Staying young is an inside job. Look at what kids are. They're curious, they're excited, they're interested—all of the very things that, if you're not careful, you're not when you're old," he said in an interview for in 2014. "You can have a 32-inch waist and no lines on your face, but if you don't keep an open-mindedness and a willingness to compete in life, no one's gonna say you're youthful."

It seems the Hollywood vet had a great time ushering in another year—he even managed to get some face time with "The Boss", Bruce Springsteen.

Happy birthday, Rob!