If you’re trying to figure out how old is Elon Musk's son, you’ve probably realized pretty quickly that there isn't just one. Elon’s family tree is less of a tree and more of a sprawling, high-tech forest at this point. As of 2026, the Tesla and SpaceX mogul is actually the father of 14 children.
Fourteen. It’s a lot to keep track of, especially when some of them are in college and others are quite literally still in diapers.
Most people asking about "the son" are usually thinking of X Æ A-Xii, the little guy who basically lives at his dad’s side during rocket launches and White House visits. But he’s just one piece of the puzzle. From the eldest twins who are officially adults now to the newborns born just a year or two ago, the age range in the Musk household is massive.
The Eldest Sons: Griffin and the Triplets
Elon’s journey into fatherhood started way back in the early 2000s with his first wife, author Justine Wilson. Their first son, Nevada Alexander, tragically passed away from SIDS at just 10 weeks old in 2002. It's a piece of the story that often gets skipped, but it's why Elon and Justine turned to IVF for their next children.
In April 2004, the couple welcomed twins. One of them is Griffin Musk, who is now 21 years old. He’s officially an adult, likely finishing up university or starting his own path away from the paparazzi. His twin, Vivian Jenna Wilson, legally changed her name and gender in 2022 and has publicly distanced herself from her father, so she usually isn't the one people are looking for when they search for "Elon's son."
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Two years after the twins, in January 2006, came the triplets.
- Kai Musk
- Saxon Musk
- Damian Musk
These three are 20 years old in 2026. They’ve stayed mostly out of the spotlight, though we know from Walter Isaacson’s biography that Damian is a bit of a math and physics prodigy. Apparently, he even became a vegetarian at age eight specifically to lower his carbon footprint. Talk about being on brand for the family.
The "Main Character": How Old is X Æ A-Xii?
This is the one you see in all the photos. Born on May 4, 2020 (Star Wars Day, fittingly), X Æ A-Xii—just "X" for short—is currently 5 years old.
He’s the first child Elon had with musician Grimes. Because he’s constantly seen sitting on Elon’s shoulders at Tesla meetings or running around the SpaceX headquarters, he’s become the face of the next generation of Musks. Honestly, it’s kinda wild to think a five-year-old has probably seen more of the inner workings of the aerospace industry than most veteran engineers.
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The Secret Sons and the Newest Additions
Things got a lot more complicated around 2021 and 2022. While the world was watching Elon buy Twitter (now X), he was quietly expanding his family with two different women at the same time.
First, there are the twins he shares with Neuralink executive Shivon Zilis. Strider Musk and his sister Azure were born in November 2021. That makes Strider 4 years old.
Then there’s the third child Elon had with Grimes: Techno Mechanicus, or "Tau." His birth was kept under wraps for a long time until that 2023 biography dropped. Tau was born in June 2022, making him 3 years old now.
But wait—there’s more.
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In late 2024 and early 2025, news broke about even more kids. Shivon Zilis confirmed the arrival of another son, Seldon Lycurgus Musk, who is roughly 1 year old as of early 2026. Around the same time, author Ashley St. Clair revealed she also had a son with Elon named Romulus, who is also about 1 year old.
Keeping It All Straight: A Quick Age Check
Since that’s a lot of names and dates, let's look at the "sons" specifically and how old they are right now in 2026:
- Griffin: 21 years old
- Kai, Saxon, and Damian: 20 years old
- X Æ A-Xii (X): 5 years old
- Strider: 4 years old
- Techno Mechanicus (Tau): 3 years old
- Seldon Lycurgus: 1 year old
- Romulus: 1 year old
It’s an unconventional setup, to say the least. Elon has been very vocal about his fears regarding "underpopulation" and the "collapse of civilization" if people don't have more kids. He’s clearly putting his money (and his DNA) where his mouth is.
What This Means for the Future
Most of these kids are living lives far removed from the average childhood. While the older ones like Griffin and the triplets have successfully stayed "low-key," the younger ones like X are being groomed for something bigger. Grimes has mentioned that Elon views X as a "protégé," which explains why he’s at every major business meeting.
If you’re following this because you’re interested in the business side of things, keep an eye on the older boys. They’re at the age where they might start appearing in the corporate structures of SpaceX or Neuralink. Damian, with his physics background, seems like a prime candidate for a future leadership role.
The big takeaway? There is no single "Elon Musk's son." There’s a whole generation of them, ranging from toddlers to young men, all growing up in the shadow of the world's richest—and arguably most eccentric—dad.
Practical Next Steps for Following the Musk Family
- Check Social Media Updates: Shivon Zilis and Grimes are often more transparent about the kids' milestones than Elon himself; following their official accounts is the best way to get real-time info.
- Read the Isaacson Biography: If you want the deep backstory on how these families interact, Walter Isaacson’s Elon Musk provides the most vetted detail on the triplets and the birth of Tau.
- Monitor SEC Filings: As the older sons (Griffin, Kai, Saxon, Damian) enter their early 20s, any official roles within Tesla or X will eventually have to be disclosed if they involve significant stock or leadership positions.