The Definitive Jeremiah Fisher Age Timeline: 5 Shocking Facts About His Age In TSITP

The question of "How old is Jeremiah Fisher in The Summer I Turned Pretty?" is one of the most frequently searched topics by fans, and the answer changes dramatically depending on which season you’re watching. As of today, December 11, 2025, the character's age ranges from a sweet sixteen in the first summer to a mature young man in his twenties by the time the highly anticipated third season is set to air, thanks to a significant time jump that mirrors the original book series.

The younger of the two beloved Fisher brothers, Jeremiah's age is crucial to understanding his relationship with Belly Conklin and the emotional stakes of the central love triangle. While he starts the series as a fun-loving, carefree teen, his journey involves major life milestones—from high school graduation to college—which all factor into his rapidly changing age throughout the show's timeline.

The Complete Jeremiah Fisher Biography and Age Timeline

Jeremiah Fisher is the younger son of Susannah and Adam Fisher, and the brother of Conrad Fisher. He is known for his magnetic personality, emotional transparency, and deep devotion to Belly Conklin. Unlike his older brother, Jeremiah is often the life of the party and wears his heart on his sleeve, making him an immediate fan favorite.

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Here is a detailed breakdown of Jeremiah’s age and key life events across the *The Summer I Turned Pretty* seasons, based on the show’s canon and the timeline established in Jenny Han's books:

• Full Name: Jeremiah Fisher
• Parents: Susannah Fisher (mother) and Adam Fisher (father)
• Sibling: Conrad Fisher (older brother)
• Best Friend/Love Interest: Belly Conklin
• Birthday: Not explicitly stated as a summer birthday, but likely late in the year (November/December) based on his school year and age relative to Conrad and Belly.
• Key Trait: The "Golden Retriever" of the Fisher brothers, known for his humor and emotional expressiveness.

1. Jeremiah's Age in Season 1: Sixteen Years Old

In the first season of *The Summer I Turned Pretty*, Jeremiah is established as being the same age as Belly Conklin. Both are sixteen years old during the summer at Cousins Beach. This places them in the same grade level, just before their junior year of high school. He is a year younger than his brother, Conrad Fisher, who is seventeen in Season 1.

This age is pivotal as it marks the first time Belly sees Jeremiah (and Conrad) as more than just a family friend, setting the stage for the love triangle that defines the series. His sweet sixteen summer is filled with first kisses, the debutante ball, and the heartbreaking revelation of his mother Susannah’s cancer.

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2. Jeremiah's Age in Season 2: Eighteen Years Old

Season 2 picks up roughly a year after the events of the first summer, which means Jeremiah has aged two years in the show's timeline, turning eighteen. This time jump is significant because it covers a period of immense change and grief following Susannah’s death.

At eighteen, Jeremiah is dealing with the emotional fallout, preparing for college, and navigating a complicated relationship with Belly that has shifted from a playful friendship to a romantic connection. This is the summer where he has graduated from high school, alongside Steven Conklin, and is preparing to attend Brown University, the same school as Conrad.

3. Jeremiah's Age in Season 3: Twenty-Two Years Old

The most surprising aspect of Jeremiah's age timeline is the massive leap in the upcoming Season 3. The third season, which adapts the final book, *We’ll Always Have Summer*, includes a significant time skip of four years.

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This jump means Jeremiah Fisher will be approximately twenty-two years old in Season 3. This places him in his final year of college, or perhaps having just graduated. The four-year gap is essential to the narrative, as it shows the characters as young adults, dealing with mature decisions about their futures, careers, and, most importantly, their final choice in the love triangle.

The Shocking Time Jump: Why Jeremiah is 22 in Season 3

The decision to jump forward four years in the narrative is not a random choice by the show's creators; it is a direct adaptation of the source material. Jenny Han’s third book, *We’ll Always Have Summer*, features a lengthy time jump to allow the characters to grow up and face more adult problems.

In the book, the time skip is necessary to establish the distance and evolution of the relationships between Belly, Conrad, and Jeremiah. By the time the story resumes, Jeremiah and Belly are deeply involved in a serious, long-term relationship that has lasted through college, setting the stage for the shocking engagement storyline that fans of the books are anxiously waiting to see on screen. This age of twenty-two for both Jeremiah and Belly ensures the emotional climax of the series carries the weight of adult commitment.

Character Age vs. Actor Age: The Gavin Casalegno Difference

While Jeremiah Fisher is a teenager and young adult in the show, the actor who brings him to life is older. The age difference between the character and the performer is a common practice in Hollywood, especially for roles that span multiple years of a character's life.

The actor who plays Jeremiah is Gavin Casalegno. Gavin was born on September 2, 1999. Given the current date of December 11, 2025, Gavin is 26 years old. This means that during the filming of the early seasons, he was slightly older than his character:

• Gavin Casalegno's Age During Season 1: Approximately 22 years old (playing 16-year-old Jeremiah).
• Gavin Casalegno's Age During Season 2: Approximately 23 years old (playing 18-year-old Jeremiah).
• Gavin Casalegno's Current Age (2025): 26 years old (playing 22-year-old Jeremiah in Season 3).

Casalegno's maturity allows him to convincingly portray the emotional depth required for Jeremiah's journey, especially as the character matures from a playful teen to a serious college student facing life-altering decisions in the later seasons. His portrayal is a key reason why the "Jelly" relationship with Belly Conklin has such a dedicated following in the *TSITP* fandom.