Fans witnessed “Young Sheldon” star Iain Armitage’s transformation as he grew up over the course 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 good match to play the childhood version of “The Big Bang Theory” character, as he was the same age at the time. While Season 1 was airing, Armitage gained weight Xformerly of Twitter, to share a photo of herself with her TV siblings, Montana Jordan and Raegan Revord, standing in front of a growth chart. The snap was published in April 2018, and the star of the show appeared to be a petite 4ft, 4in.
As the series progressed, so did Armitage’s notch on the growth chart. When the final season of “Young Sheldon” began airing in February 2024, Sheldon’s character was 14 years old. Obviously, both the character and the actor portraying him would have grown considerably since the early seasons. Armitage, 16 years old at the time, had gone from a child to a young man. Viewers noticed 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 got so tall, especially in the last seasons (…) it really matches how tall he is in ‘TBBT,'” one fan wrote in a Reddit post around the time the last episodes aired. Armitage is listed as standing 5 feet, 10 inches tall, which is just a few inches shorter than Parsons’ 6-foot, 1-inch build.
Fans swooned over Iain Armitage’s adult photos
In April 2024, when the final season of “Young Sheldon” aired, Iain Armitage sent to Instagram. The photo was a behind-the-scenes look at his 8-year-old self filming the show’s first episode. “I don’t think this kid could have predicted 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 the young Armitage holding a folder at school.
The following year, fans could see how much Armitage had grown since the show’s early days. Not long after turning 17, the “Young Sheldon” alum uploaded two selfies to Instagram, wearing glasses and striking Blue Steel-type poses that gave him a mature air. Followers popped into the replies to comment on how much Armitage had changed. “You’re growing up too fast (Kleenex emoji) just the other day you went to school in a bow tie,” one wrote. “Gosh, I almost didn’t recognize him. He’s pretty handsome,” another user commented about the glow.
Armitage’s transformation continued after “Young Sheldon” endedwhen he returned to CBS for a guest appearance on “Ghosts” in April 2026. Afterwards, Armitage talked about how he was looking forward to trying other roles that were different from Sheldon Cooper. “Because I started doing it when I was so young, I have a lot of people who will come up to me and tell me, ‘You look so different,'” he shared. Us Weekly. Armitage mentioned 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.
