How Old Are the Percy Jackson Characters in Season 3? Character and Actor Ages

Season 3 of Disney+’s Percy Jackson and the Olympians adapts Rick Riordan’s third novel, The Titan’s Curse. The story introduces several important characters while putting familiar ones in situations that change their relationships, responsibilities and futures.

But how old are these characters when the story takes place? And how do their ages compare with the actors playing them?

Below, you’ll find the major characters’ ages according to the book timeline, explanations of the unusual cases, and a comparison with the Season 3 cast. Character ages and actor ages are treated separately because the television series has not independently confirmed every character’s exact age.

Percy Jackson Characters’ Ages at a Glance

The following ages are based on the events of The Titan’s Curse, rather than confirmed on-screen ages in the Disney+ adaptation.

Most of the younger demigods have relatively straightforward ages. Grover’s age requires an explanation because satyrs mature differently from humans. Nico and Bianca are another special case because the Lotus Hotel and Casino disrupted their experience of time.

The three immortals also belong to a different category altogether. Their existence stretches across generations of Greek mythology, making ordinary human age comparisons largely meaningless.

How Old Is Percy Jackson in Season 3?

Percy Jackson is 14 years old during the events of The Titan’s Curse. He was 12 when his adventures began in The Lightning Thief and turned 13 before the events of The Sea of Monsters. His birthday is August 18, and the third book takes place in December, making him 14 by the time the new adventure begins.

His age is particularly important because of the Great Prophecy. The prophecy concerns a child of one of the Big Three gods: Zeus, Poseidon or Hades. When that demigod reaches 16, a decision will determine the future of Olympus. Percy, as Poseidon’s son, is one of the possible candidates.

That makes every passing year significant. He is still learning how to navigate the world of gods and monsters, but the prophecy suggests that he will eventually face a decision far beyond the responsibilities of an ordinary teenager. The situation becomes more complicated when Thalia returns. Percy is no longer the only child of the Big Three whose approaching sixteenth birthday could change everything.

In the Disney+ adaptation, Walker Scobell plays Percy. Born on January 5, 2009, he is 17 years old.

How Old Is Annabeth Chase in Season 3?

Annabeth Chase is 14 years old in The Titan’s Curse. She is slightly older than Percy. Her birthday is July 12, while Percy’s is August 18, making her approximately five weeks older.

Although the difference is small, Annabeth has considerably more experience at Camp Half-Blood. She arrived there when she was seven after running away from home. During her early journey, she travelled with Luke Castellan and Thalia Grace before eventually finding safety at the camp. Those years have helped her develop a deep understanding of Greek mythology, monsters and the dangers facing demigods.

Annabeth is also an experienced strategist. While Percy often relies on instinct and his abilities as Poseidon’s son, she is more likely to approach a difficult situation by studying the risks and looking for a clever solution.

Her importance becomes particularly clear in The Titan’s Curse. Annabeth disappears early in the story after an encounter with the forces threatening Olympus. Her disappearance gives Percy a personal reason to undertake the rescue mission.

How Old Is Thalia Grace in Season 3?

Thalia Grace is 15 years old when she returns to the story in The Titan’s Curse. Her age is particularly significant because she is approaching her sixteenth birthday, the age connected to the Great Prophecy.

She was twelve when she made her stand on Half-Blood Hill and Zeus turned her into the pine tree that guarded the camp. She stayed a tree for roughly six years and woke up the age she had been when she fell, which is why she returns at fifteen while the friends she protected are now in their twenties.

Her return changes the situation surrounding the prophecy. Percy is no longer the only obvious candidate whose sixteenth birthday could determine the fate of Olympus.

Thalia also has a complicated history with Luke. They once travelled together, and his betrayal makes their reunion particularly difficult. Her relationship with Percy is different, too. Both are children of the Big Three, and neither is especially comfortable with the idea of another person potentially sharing that responsibility.

Book spoiler: Before that birthday arrives, Thalia swears herself to Artemis and joins the Hunters. Hunters stop aging — though they can still die in battle — so the choice takes her out of the prophecy entirely.

How Old Are Nico and Bianca di Angelo in Season 3?

Nico di Angelo is 10 years old, while his older sister Bianca is 12. Their ages are among the most unusual in the series because their childhood does not follow the normal timeline.

Nico and Bianca were born decades before Percy and his friends. However, they spent a significant period inside the Lotus Hotel and Casino in Las Vegas, a magical place where time passes differently from the outside world. People inside the hotel can lose track of how much time has passed. While their experience may feel relatively short, the outside world continues moving forward.

This explains why Nico and Bianca appear to be children despite having been born much earlier than Percy’s generation. It is important to distinguish between their chronological history and their physical ages. Calling them simply eighty- or ninety-year-old children would give readers the wrong impression of their actual development.

Their arrival introduces a different kind of challenge for Percy and the other demigods. Bianca has spent much of her life looking after Nico. When she gets an opportunity to make her own decisions, she has to consider whether she wants to continue living primarily as his protector.

Nico, meanwhile, is still young enough to see the world through the excitement of Mythomagic, mythology and his relationship with his sister. He does not initially understand why Bianca might want a life beyond taking care of him.

Their relationship becomes especially important as the story progresses. Bianca’s decisions have consequences for Nico that extend well beyond the events of the third book. In Season 3, Levi Chrisopulos plays Nico, while Olive Abercrombie portrays Bianca.

Their full backstory is in our Nico and Bianca di Angelo article.

How Old Is Grover Underwood in Season 3?

Grover Underwood is 28 years old in the commonly cited The Titan’s Curse character chronology. That might sound surprising because Grover looks and behaves much younger than a typical 28-year-old human.

The explanation lies in his species. Grover is a satyr, and satyrs age differently from humans. Their physical development is approximately half as fast, meaning a 28-year-old satyr is often compared with a 14-year-old human. His appearance therefore makes more sense once readers understand how satyr aging works.

Grover is also much more than Percy’s nervous companion. As a protector, he has an important responsibility to identify young demigods, help them reach safety and guide them toward Camp Half-Blood. His long-term ambition is to find Pan, the ancient god associated with nature and the wild. This personal mission gives him motivations that extend beyond simply helping Percy with his latest adventure.

How Old Is Luke Castellan in Season 3?

Luke Castellan is 21 years old during the events of The Titan’s Curse, according to the commonly cited character chronology. He is considerably older than Percy, Annabeth and the younger campers at Camp Half-Blood.

When Percy first arrives at camp, Luke initially appears to be a helpful older demigod. He understands the dangers of their world and seems willing to help Percy adjust to life among the other campers. However, Luke’s relationship with the Olympian gods is far more complicated than Percy initially realizes.

He has spent years feeling abandoned and betrayed by the gods. His resentment eventually leads him to support Kronos, turning him into one of the central threats facing the demigods. The age difference helps explain their different perspectives. Percy is still discovering his identity and learning about the world of Greek mythology, while Luke has already experienced years of disappointment and conflict.

Luke’s age also changes as the story progresses, so it is important not to confuse his age in The Titan’s Curse with his age at other points in the series. Charlie Bushnell portrays Luke in the television adaptation. Born on June 16, 2004, he will be 22 years old on November 20, 2026.

How Old Are Artemis, Zoë Nightshade and Atlas?

Not every character in The Titan’s Curse has an ordinary human age. Artemis, Zoë Nightshade, and Atlas belong to the ancient world of Greek mythology, where immortality changes how we understand age.

Artemis

As an immortal goddess, Artemis does not have a conventional human age. She is the goddess of the hunt, wilderness and the moon, and leads the Hunters of Artemis. Her followers are girls who have sworn loyalty to her and received immortality in return.

Although Artemis often appears in the form of a young girl, that appearance does not reflect how long she has existed. Her role in The Titan’s Curse is particularly important because she disappears while pursuing a dangerous monster. Finding and rescuing her becomes one of the central objectives of the quest.

Zoë Nightshade

Zoë Nightshade is thousands of years old and serves as one of Artemis’s most trusted Hunters. Her history connects her to ancient Greek mythology, long before Percy and his friends were born.

She previously served the legendary hero Heracles and has lived through events that most demigods know only from stories. This long history also influences her personality. Zoë can be formal, serious and occasionally difficult to understand, particularly when her experiences and language reflect an entirely different historical period.

Her relationship with Thalia is initially complicated, but the two gradually develop a greater understanding of one another. Zoë’s connection to Atlas also makes her one of the most important characters in the story.

Atlas

Atlas is an ancient Titan and one of the most powerful figures in The Titan’s Curse. In Greek mythology, the Titans belonged to an older generation of divine beings who fought against the Olympian gods.

Atlas is best known for his punishment: holding up the sky. His connection to the story is particularly important because he is Zoë Nightshade’s father. Their history adds another personal dimension to the conflict between the Titans and the Olympians.

There is no meaningful human age to assign to Atlas. He is an ancient immortal whose existence predates the current generation of gods and demigods.

Percy Jackson Season 3 Cast: How Old Are the Actors?

The actors portraying the demigods are generally older than their fictional characters. This is common in television adaptations, particularly when young characters are played by teenage performers.

The following table compares the main Season 3 cast with their characters’ ages in the book timeline. Actor ages are calculated using publicly reported birth dates and the scheduled November 20, 2026 premiere date.

The differences are especially noticeable with Thalia, Grover and the Di Angelo siblings.

Tamara Smart is six years older than the character she portrays, while Aryan Simhadri is younger than Grover’s chronological age in the books. Levi Chrisopulos and Olive Abercrombie, meanwhile, portray characters whose childhoods have been affected by the unusual passage of time.

It is also worth remembering that the actors’ real ages do not determine their characters’ ages. Casting decisions involve performance, chemistry, physical requirements and the needs of the adaptation.

Disney has confirmed the Season 3 cast and its adaptation of The Titan’s Curse, but the book ages above should not be mistaken for a complete official list of television character ages.

Why Character Ages Matter in The Titan’s Curse

The ages in The Titan’s Curse are not just background details. They help explain why the third story is such an important turning point for Percy and the other demigods.

Percy is getting closer to the age mentioned in the Great Prophecy, but Thalia’s return introduces another possible candidate. Nico and Bianca bring a different complication because their childhood has been shaped by the strange passage of time inside the Lotus Hotel.

Meanwhile, Artemis, Zoë and Atlas connect the younger generation of demigods to a much older world of Greek mythology.

These overlapping timelines give The Titan’s Curse much of its tension. The characters are not simply getting older; they are approaching decisions that could change their lives and the future of Olympus.

Percy Jackson Season 3 premieres on November 20, 2026, on Disney+ and Hulu, with two episodes every Friday through the December 11 finale. Every date is in our Season 3 release schedule.

Last updated: November 10, 2026.

Jonas

I’m the writer behind Fandom Watch, where I share news, guides, and fan theories about shows, anime, and the wider world of pop culture. My goal is to make fandom fun and accessible for everyone, whether you’re a casual viewer or a die-hard fan.