"Happy Birthday @elonmusk. Thank you for 53 years of joy and enthusiasm," he wrote on Instagram.

Along with the post, he shared a photo of the Tesla CEO celebrating his childhood birthday.

May Musk said, "Hope you smile as much today as you did on your 4th birthday, when you saw the cake your Aunt Lynn made for you. So proud of you."

Future Ventures co-founder Steve Jurvetson also wished the tech billionaire on his birthday.

"Happy Birthday, Elon Musk. And 30 years ago, living the American dream," Jurvetson wrote.

Many users also wished Musk on his birthday in the comment section.

One user wrote, "Happy Birthday Elon Sir. Have the best day and enjoy every good thing happening in your life. And many more."

Another user said, "Happy Birthday to Elon! Wish him all the happiness in the world."

Another user said, "Happy birthday Alan and blessings to you for sharing him with the world. He saved us."