Honestly, keeping track of Elon Musk’s family tree is basically a full-time job at this point. If you’ve been scrolling through X or catching headlines lately, you probably realized the "how old is elon musks son" question isn't as simple as one number. There isn't just one son. As of early 2026, Elon has 14 children (that we know of), and the age gap between the oldest and the youngest is pretty wild.
We’re talking about a range that spans from grown adults in college to a baby who was just born about a year ago. It’s a lot.
The Older Crew: The Musk Sons from the Early Days
Elon’s first five surviving children are with his first wife, Justine Wilson. These guys are mostly adults now, living lives that are surprisingly low-key given who their dad is.
Griffin Musk is the oldest. He was born on April 15, 2004, which makes him 21 years old. He’s often seen at tech events or occasionally traveling with Elon, but he doesn't post much on social media himself. His twin, Vivian Jenna Wilson, is also 21, though she has famously distanced herself from her father.
Then you have the triplets: Kai, Saxon, and Damian Musk. They were born in 2006. As of January 2026, they are 19 or 20 years old (depending on the specific month, though they usually celebrate around the start of the year). Damian has made a few minor headlines for being a dedicated vegetarian since he was eight, apparently to lower his carbon footprint. These three are right in that college-age bracket, likely figuring out their own paths while the rest of the world focuses on their younger siblings.
The "X" Era: How Old Is Lil X?
When people search for "how old is Elon Musk's son," they are usually thinking of the little guy who became a meme the moment his name was announced. X Æ A-Xii, known simply as X, was born on May 4, 2020.
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That makes X 5 years old right now.
He’s the one you see on stage at SpaceX launches or sitting on Elon's shoulders in the Oval Office. He’s essentially the face of the next generation of Musks. His younger brother with Grimes, Techno Mechanicus (Tau), was born in June 2022. Tau is 3 years old.
It’s kind of crazy to think that X is already starting school age. Time flies, especially when your dad is trying to colonize Mars.
The Newest Additions: 2024 and 2025 Babies
This is where it gets really busy. Elon has been very vocal about his fears regarding underpopulation, and he’s certainly doing his part to address it.
He has four children with Neuralink executive Shivon Zilis. Their twins, Strider and Azure, were born in November 2021, making them 4 years old. Then came Arcadia, born in February 2024 (she’s nearly 2 years old), and a son named Seldon Lycurgus, who was born in late 2024 or early 2025. Seldon is roughly 1 year old.
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Then there is the latest public drama.
In early 2025, influencer Ashley St. Clair revealed she had a son with Elon named Romulus. According to reports, Romulus was born around September 2024. As of January 2026, Romulus is 1 year old.
Just this week, Elon actually posted that he’s seeking full custody of Romulus. It’s a mess of legal filings and public statements, but the math is clear: the youngest Musk son is currently a toddler just finding his feet.
A Quick Cheat Sheet on the Sons' Ages (Jan 2026)
- Griffin: 21 years old
- Kai, Saxon, Damian: 19–20 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
Why Does Everyone Care?
It’s not just celebrity gossip. People are fascinated by these kids because they represent the legacy of one of the richest men in history. Will they take over Tesla? Will they be the first people to live on Mars?
There’s also the complexity of the "Musk Family" dynamic. You have children from four different mothers, some of whom are in the spotlight and some who are completely invisible.
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Elon’s views on parenting are also... unique. He’s said before that "babies are just eating and pooping machines," but as they get older, he becomes much more involved. You can see that with X, who is practically his father’s shadow at this point.
What This Means for the Future
If you're trying to keep up, the best thing to do is focus on the "generations." You have the "Early Musks" (the adults), the "Grimes Era" (the toddlers/preschoolers), and the "Current Era" (the babies).
The age of Elon's sons ranges from 1 to 21. That's a huge spectrum of development. While Griffin might be looking at career paths or finishing a degree, Romulus is likely just learning his first words.
Actionable Insight: If you're following the legal battles or the family news, keep an eye on court filings in Texas and California. Most of the "new" information about his children—including names and exact birth dates—tends to come out through public records rather than press releases. If you want the most accurate info, look for updates regarding the custody dispute with Ashley St. Clair, as that's where the most recent "youngest son" details are being confirmed.