“Old Me” is the third track from 5SOS' fourth studio album, CALM. The song features lead vocals from Luke Hemmings, who sings about his past self and everything he went through to become the man he is today. Both Luke and Ashton co-wrote the song, with the help of several other songwriters.

The song was first teased on February 19, 2020 on Twitter, along with a picture which features each member from when they were younger.