"Ain't It Fun" is a song by the American rock band Paramore, released in 2013 as part of their self-titled album. The track blends elements of pop and rock, featuring catchy melodies and upbeat rhythms. Its lyrics explore themes of growing up and facing the realities of adulthood, emphasizing the challenges and responsibilities that come with it. The song received critical acclaim and commercial success, reaching high positions on various music charts. It showcases Paramore's evolution in sound and style, moving towards a more mainstream pop influence while retaining their rock roots. The song's relatable message resonates with many listeners.