On “18”, Brian, Kris, Joji and Trippie boast about the fame, success and popularity they’ve acquired at such young ages; hence the title of the track, which was the age of both Brian and Trippie at the time of release. Joji addresses this success through the evolution of his profession whereas the other collaborators take a more braggadocious approach, such as:
They said that I won’t make it
They said that I won’t change
They say that I’m not flexing
Now they say wow, you’ve changed
The official music video was uploaded on the 18th of January, 2018, (1/18/18) which hints at the name of the song.
“18” is the first official collaboration between any of the artists involved in the song, yet Joji and Bauuer have benefitted each other in the past: Joji used Baauer’s song “Harlem Shake” to birth the largest meme of early 2013, which propelled both their careers.