Olderbrothercore is an aesthetic based on stereotypical objects and traits associated with teenage older brothers in the early 1990s to early 2010s. These traits often include popularity, rebelliousness, and traditional masculinity. The archetype is frequently drawn from 2000s media, which portrayed these characters as "cool" figures, often serving as either mentors or bullies to their younger siblings.

The visuals seen in this aesthetic are a blend of different subcultures and aesthetics popular amongst this demographic in the 1990s and 2000s, such as Grunge, Skater, Nu-Metal, Emo, and Teenpunk. Lifestyle elements of this sort of teen are also the main visual, such as pictures of what he would do in his free time.

An example of a character for this aesthetic is Rodrick Heffley from Diaries of a wimpy kid.