The rocker himself acknowledged the big day on Instagram, writing, "They say it is my birthday and I'm looking forward to being spoilt rotten by my loved ones!"
One of those loved ones was daughter Stella McCartney, who took to social media to mark her dad's big day.
McCartney also got birthday shout outs from the likes of The Rolling Stones' Ron Wood, and The Beach Boys' Brian Wilson, as well as Julian Lennon, son of McCartney's Beatles bandmate John Lennon.
"Hoppy Birdy, Uncle Paul! Only love…," he wrote, next to a video set to The Beatles' "Hey Jude," which McCartney wrote to comfort him after Lennon split from his wife and Julian's mother Cynthia.