Fans witnessed Iain Armitage’s transformation from ‘Young Sheldon’ star as he grew up throughout the duration of the series, eventually leading to a lot of talk about his growth spurt. When the show’s first season premiered in September 2017, Sheldon Cooper’s character was 9 years old. Armitage was a great fit to play the child version of the “The Big Bang Theory” character, as he was the same age at the time. While season 1 was airing, Armitage started working on it Xformerly Twitter, to share a photo of himself with his TV siblings, Montana Jordan and Raegan Revord, standing in front of a growth chart. The photo was posted in April 2018 and the series star appeared to be just 4 feet tall.
As the series progressed, so did Armitage’s notches on the growth chart. When the final season of “Young Sheldon” aired in February 2024, Sheldon’s character was 14 years old. It’s clear that both the character and the actor portraying him have grown significantly since the first seasons. Armitage, then 16 years old, had gone from child to young man. Viewers took notice Armitage plays a young Jim Parsons – the actor who originally played Sheldon on ‘The Big Bang Theory’ – was a perfect choice to fill the actor’s shoes. “Sheldon has gotten so big especially in the last few seasons (…) it really matches how big he is in ‘TBBT,'” one fan wrote in an Reddit post around the time the final episodes aired. Armitage is listed as being 6-foot-1, which is just a few inches shorter than Parsons’ 6-foot-4 frame.
Fans are swooning over Iain Armitage’s adult photos
In April 2024, as the final season of “Young Sheldon” aired, Iain Armitage posted on Instagram. The photo was a behind-the-scenes look back at his 8-year-old self filming the first episode of the series. “I don’t think this boy could have anticipated what it would feel like to film our final scene all these years later,” the actor wrote in the touching caption alongside a photo of young Armitage holding a briefcase at school.
The following year, fans were able to see how much Armitage had grown since the early days of the series. Not long after turning 17 years old, the “Young Sheldon” alumnus uploaded two selfies to Instagram in which he wore glasses and struck Blue Steel-esque poses that gave him a grown-up look. Followers appeared in the comments to comment on how much Armitage had changed. “You’re growing up too fast (Kleenex emoji), the other day you went to school wearing a bow tie,” said one wrote. “Gosh, I almost didn’t recognize him. He’s quite handsome,” another user commented about lighting up.
Armitage’s transformation continued after “Young Sheldon” endedwhen he returned to CBS in April 2026 for a guest appearance on “Ghosts”. Armitage then talked about how he was looking forward to trying out roles other than Sheldon Cooper. “Because I started doing this when I was so young, there are a lot of people who come up to me and say, ‘You look so different,’” he said. We weekly. Armitage did say that while he was happy to move on as he aged out of the role, he still embraced fans who knew him as Young Sheldon.
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