Arnold Schwarzenegger celebrates his birthday in the gym with son Joseph Baena

Happy birthday Arnold Schwarzenegger!

Although the "Terminator" actor just turned 72-years-old, he's never looked better. Joseph Baena took to Instagram on Tuesday to celebrate his dad, sharing a photo of them training at Gold's Gym- the famous location where Schwarzenegger spent most of his time during his high-profile bodybuilding career. 

"BIG happy birthday to the best training partner in the world! Love you dad,” the 21-year-old wrote alongside the photo.

Fans gushed in the comments section praising the former politician. "You are so lucky to be his son. He has been my idol since I was a small boy. He is the reason I wanted to start working out," one person wrote. 

SEE ALSO: Arnold Schwarzenegger's look-alike son, Joseph Baena, recreates iconic pose

Patrick Schwarzenegger also honored his dad, sharing a photo with his siblings, Christina, Christopher and Katherine, whom Arnold shares with ex-wife Maria Shriver.  The Instagram showcases a hilarious cake with a photo of Arnold in a hot tub smoking a cigar, clearly living his best life.

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Arnold Schwarzenegger's son, Joseph Baena
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Arnold Schwarzenegger's son, Joseph Baena
Happy Birthday to the man that's always pumped! Love you dad 🎉
Happy Father's Day to the man that's almost as big as I am ❤️
Mans best friend
In this pic, a year ago, I was just under 185lbs (83kg). This is the moment I decided I wanted to pursue bodybuilding #Swimmerbod #Steadygrowth #RoadTo215
It's only the beginning 🙌🏼 #progress #classicphysique @seancaseyfitness
When in Rome... -Ron Burgundy
Working on the tan lines 🌞 . . . . Thanks @chase_minor for capturing the moment!!! 🙌🏼
Had to take advantage of the lighting 😅 #classic #sidechest #trainheavy
We couldn't walk next to each in the hallways... Thanks for the workout Mike!
Happy 4th of July! 🎈🇺🇸🎆🎇
A little culture & a little neature @gettymuseum
California Dreamin'
I'm so dang proud of my momma! Today she graduated culinary school and I could be happier for her as she continues to live out her dreams as a chef! 💕Next stop...#TopChef #IronChef
Only at ATΩ formal can you be Bad & Boujee
The face you make when you're chilling with a monkey and you remember you have 2 papers due this week 😬
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