17 Throwback Photos That Remind You Of Baby 5SOS 

17 Throwback Photos That Remind You Of Baby 5SOS

They\'ve been together for 4 years, and oh, how they\'ve changed.

It was four years ago when Ashton Irwin joined his mates from school to make a band in Australia. His friends — Luke Hemmings, Calum Hood and Michael Clifford — had been posting cover videos on YouTube under Luke’s channel, hemmo1996. It was time they made it official — they were 5 Seconds of Summer.

The 5SOS Fam are having a blast passing around old pictures of the guys today in celebration of four years of the band.

Remember when they used to play small shows? I don’t!

Now they have a sold out arena world tour #4YearsOf5SOS pic.twitter.com/747pXLdVMI

so proud of these four stupids @5SOS #4YearsOf5SOS pic.twitter.com/js6L50MbVT

— 4 years of 5sos (@asyIummichaeI) December 3, 2015

#4YearsOf5SOS so much has changed with my babes!! proud of you guys forever and always❤️ and how did this happen? pic.twitter.com/3WRQYUztqP

— happy 5sos' day (@fuggiamocalum) December 3, 2015

#4YearsOf5SOS so crazy, feel like a proud mother ❤️ pic.twitter.com/xLgaw3SKxf

They knew they wanted to be a band all along

I'm so proud of my boys :') #4YearsOf5SOS pic.twitter.com/r104Hu4FZH

— huke lemons (@idjitjudy) December 3, 2015

From sitting around in a living room to rocking onstage

From covers on youtube to sold out arenas worldwide #4YearsOf5SOS pic.twitter.com/ofO0uNEHM4

They made me happy and i'll always here for them. "real fans save bands, real bands save fans" #4YearsOf5SOS pic.twitter.com/RbNXHzV1MF

5SOS fan Nicole made me a tad emotional with this collage

I made this a while ago but damn still so emotional #4YearsOf5SOS pic.twitter.com/ToujpHVNmj

— Please Luke | Nicole (@HashtagLuke5SOS) December 3, 2015

5SOS busking on the street with Myspace hair

They have achieved so much as a band I'm so proud of them #4YearsOf5SOS #proudof5sos pic.twitter.com/8yTgYVXD3z

— WE LOVE YOU LUKE (@PleaseStop5sos) December 3, 2015

Some would argue that they haven’t grown up…

— Ashton Irwin (@Ashton5SOS) December 3, 2015

— 5 Seconds of Summer (@5SOS) December 3, 2015