How Old Is The Actor Who Plays Jeremiah Fisher

So, you’ve been binge-watching The Summer I Turned Pretty, and let’s be honest—you’re not just here for the love triangle drama. You’re here for Jeremiah Fisher, the golden-haired, sunshine-smiling brother who makes every scene a little brighter. And now you’re wondering: How old is the actor who plays him? Grab your iced coffee, friend—we’ve got the scoop.

The actor in question is Gavin Casalegno, and he’s doing that magical thing where he plays a teenager while actually being a real, breathing adult. As of 2025, Gavin is 25 years old. Yes, you read that right: 25. Meanwhile, his character, Jeremiah, is supposed to be around 16 or 17 in the series. That’s almost a decade of life experience magically squeezed into a high school timeline. But hey, Hollywood math has never been our strong suit—remember when 30-year-olds played high schoolers in the ’90s? Exactly.

Here’s the funny part: Gavin was born on September 4, 1999, which means he’s a Virgo with a side of “I look 19 forever.” He started acting at age 10, so by the time he auditioned for Jeremiah, he already had more credits than most of us have coffee cups. He’s also a pilot, a musician, and—brace yourself—married. Yep, while you’re swooning over his on-screen charm, he’s probably at home making dinner with his wife. Talk about a plot twist.

So why does this age thing matter? Because it’s a reminder that talent doesn’t wait for a birthday. Gavin brings a warmth and depth to Jeremiah that feels authentic, even if he’s technically old enough to be his character’s older brother in real life. And honestly? That just makes the show’s magic even more impressive. So next time you watch him joke with Conrad or steal your heart with a single smile, just remember: he’s 25, he’s married, and he’s still absolutely nailing the whole “heartthrob” thing. Age is just a number, but charisma? That’s forever. Now go enjoy the next episode—you’ve earned it.