Jeremiah is 22 years old in season 3 of The Summer I Turned Pretty.

Quick Scoop: How old is Jeremiah in season 3?

In season 3, the story jumps ahead several years, and the characters are no longer teens at Cousins Beach but young adults dealing with college, careers, and serious relationships. Within this time jump, Jeremiah Fisher is confirmed to be 22 years old.

Ages after the time jump

Here’s where the core trio land age‑wise in season 3:

  • Belly: 21
  • Jeremiah: 22
  • Conrad: 23

Several entertainment outlets and cast/character breakdowns all line up on Jeremiah being 22 in season 3, explicitly listing: “Jeremiah’s age in season 3: 22.” Articles discussing the four‑year time skip also state that Belly is 21, Jeremiah is 22, and Conrad is 23, matching the show’s new timeline.

So if you’re watching season 3 and wondering “how old is Jeremiah in season 3?” the in‑universe answer is a clear 22 — older, more mature, and right in that post‑college, figuring-life-out phase.

TL;DR: Jeremiah Fisher is 22 years old in The Summer I Turned Pretty season 3.

Information gathered from public forums or data available on the internet and portrayed here.