“19” is the seventh song by Stray Kids’s album Clé 1: MIROH. The song is the first release completely written by Han, the lead vocalist and main rapper of the group, while the track is co-composed by fellow Stray Kids members and producing group 3RACHA member Bang Chan.

The song talks about Stray Kids' fear of passing the limit and reminiscing about the time when they were teenagers as 19 is the last of the teen years. The song also tackles with the fear of entering adulthood.

It is also important to note that in the credits, it is listed as “arranged by Chan” which differs from the standard credit for Bang Chan that typically appears as “방찬 (3RACHA).” However, whether this is for an intentional reason or if the arrangement is by another artist of this name has yet to be confirmed.