PHOTOS | Child star Jacob Tremblay is all grown up on red carpet: 'How it started vs how it's going'

Jacob Tremblay is 16 years old now – all grown up from when he starred in Room in 2015 at the age of 7.

The actor hopped on a popular social media trend when he shared a throwback photo next to a pic of him at the premiere of his new film My Father's Dragon recently.

"How it started vs how it's going," he captioned it, sending social media into a frenzy.

Apart from Room, you would've seen Tremblay in Wonder, Good Boys, while he voiced Luca in the Disney movie. He also portrayed a young Justin Bieber in his Lonely music video.

The actor will lend his voice to the character of Flounder in Disney's upcoming live-action of The Little Mermaid.

"Nope. I refuse to believe time is moving that fast… not on my watch," one fan commented on Twitter after the post went viral, while another said: "Good Lord when the children from new movies evolve into teen heartthrobs you start realising you're closer to the grave than you ever imagined."

Another simply tweeted: "OKAYYY JACOBBBBBB. WE SEE YOU."