The Fisher Brother Mystery Solved: Are Conrad And Jeremiah Twins In The Summer I Turned Pretty?

The enduring mystery surrounding the ages of the Fisher brothers, Conrad and Jeremiah, has fueled countless fan discussions and debates since The Summer I Turned Pretty first hit screens. As of December 13, 2025, with anticipation building for the final season, one question remains paramount for fans new and old: Are Conrad and Jeremiah twins? The short and definitive answer, based on both Jenny Han's original book trilogy and the Amazon Prime Video series, is a resounding no. The two heartthrobs at the center of Belly Conklin's love triangle are not twins, though the nature of their close age difference often leads to this confusion.

This age difference, while seemingly small, is a crucial detail that significantly shapes their personalities, their relationship with each other, and their respective dynamics with Belly. Understanding the exact gap between Conrad and Jeremiah Fisher is key to appreciating the complex narrative of the series, especially as the story moves toward its conclusion in the highly anticipated third season. Their status as brothers, but not twins, informs the older brother/younger brother dynamic that is central to the drama at Cousins Beach.

The Definitive Ages and the "Irish Twins" Confusion

To fully grasp the relationship between the two Fisher boys, it is necessary to establish their respective ages as they are presented in the source material and the television adaptation. This detail is often a point of confusion due to the show's occasionally ambiguous timeline and the fan-coined term "Irish twins."

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Conrad Fisher: The Older Brother

Conrad Fisher is consistently established as the older brother. In the first season of The Summer I Turned Pretty, Conrad is 17 years old. He is a year and a half older than Belly Conklin, who is turning 16 at the start of the summer. This age gap reinforces his role as the more reserved, responsible, and often brooding figure. By the time Season 2 airs, Conrad is approximately 19, having completed his first year of college at Brown University.

• Full Name: Conrad Fisher
• Role: Older brother, Belly's first love
• Age in Season 1: 17
• College: Brown University
• Defining Traits: Brooding, protective, academically focused, struggles with emotional vulnerability.
• Astrological Sign (Fan Theory): Often speculated to be a Cancer or Scorpio, reflecting his intense emotional depth.

Jeremiah Fisher: The Younger Brother

Jeremiah Fisher is the younger of the two brothers. In Season 1, Jeremiah is 16 years old, making him the same age as Belly. This shared age and grade level is a major factor in their easygoing, best-friend dynamic, which eventually blossoms into a romantic relationship. Jeremiah's birthday is noted to be at the end of September, placing him in the same calendar year as Belly and Steven Conklin, but a calendar year younger than Conrad. By Season 2, Jeremiah is also around 18 or 19, attending Finch University with Belly.

• Full Name: Jeremiah Fisher
• Role: Younger brother, Belly's boyfriend (Season 2)
• Age in Season 1: 16 (same age as Belly)
• College: Finch University
• Defining Traits: Outgoing, fun-loving, emotionally expressive, people-pleaser, sexually fluid (in the show).
• Astrological Sign (Fan Theory): Often speculated to be a Libra or Sagittarius, reflecting his social and adventurous nature.

The term "Irish twins" is frequently used by fans on social media to describe their relationship. This is a colloquial term for siblings born within the same calendar year or less than 12 months apart. While not literally true in their case—Conrad is a calendar year older—the phrase captures the essence of their close-in-age, intensely competitive, yet deeply bonded relationship. They are close enough in age that they often share friend groups and milestones, blurring the traditional older/younger brother lines, but the age difference is still significant in their maturity levels and life stages.

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Why the Age Difference Matters for the Love Triangle

The one-year age gap between Conrad and Jeremiah is more than a trivial detail; it is a foundational element that dictates the entire trajectory of the love triangle with Belly Conklin. Their respective ages influence their maturity, their life experiences, and how they approach their feelings for Belly.

The Conrad Dynamic: Maturity and Distance

Conrad's status as the older brother gives him a perceived air of maturity and distance, particularly in the first book/season. He is often seen as the more serious one, dealing with the weight of family expectations and his mother, Susannah Fisher's, illness. His slightly older age means he is often a step ahead of Belly in life—starting college, driving, and experiencing 'adult' issues—which contributes to the 'unattainable crush' dynamic that Belly has for him. His emotional unavailability, a key characteristic, is partly a product of his older brother role, feeling the need to be strong and stoic for everyone around him.

The age difference also plays into the concept of a 'first love' that feels more intense and profound, but perhaps less stable. Belly's feelings for Conrad are rooted in a childhood idealization that is challenged by the complexities of his late-teen maturity and emotional struggles.

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The Jeremiah Dynamic: Friendship and Equality

Jeremiah’s status as the younger brother, and being the same age as Belly, creates a relationship built on immediate equality and genuine friendship. They are peers navigating the same life stage—high school, first parties, and college applications. This shared experience makes their connection feel lighter, more fun, and initially, less complicated.

Their relationship evolves from a deep platonic bond into a comfortable, easy romance. Jeremiah is the one who is emotionally present and transparent, a stark contrast to Conrad. His younger-brother status means he is often the peacemaker, the one who tries to keep things light, but also the one who is acutely aware of the shadow cast by his older brother. The sibling rivalry between them, particularly over Belly, is more pronounced precisely because their ages are so close, making them direct competitors for attention and affection.

The Fisher Family Dynamics and Topical Authority

The structure of the Fisher family—Susannah and Adam Fisher's two sons—is a classic literary device used to explore sibling rivalry, different paths to maturity, and the multifaceted nature of love. The lack of twin status is essential for establishing their distinct identities:

• Conrad: The heir apparent, the one who feels the pressure to be perfect and follow the traditional path.
• Jeremiah: The free spirit, the one who strives to be different and often feels overlooked or misunderstood by his parents and Belly.

This dynamic is further complicated by the emotional toll of Susannah Fisher's cancer diagnosis, which affects each brother differently based on their personality and perceived role in the family. Conrad retreats and becomes distant, while Jeremiah leans into his role as a supportive, expressive caregiver.

Ultimately, the question of whether Conrad and Jeremiah are twins is a fascinating entry point into the deeper themes of The Summer I Turned Pretty. They are not identical in age, personality, or their approach to life and love. They are two distinct individuals, separated by a crucial year, whose differences create the perfect storm for the beloved and agonizing love triangle that has captivated millions of readers and viewers worldwide. As fans await the final chapter, the choice between the older, intense Conrad and the younger, sunshine-y Jeremiah continues to be the ultimate debate.