The '9-Year-Old Army' is the affectionate and ironic name given to the massive fanbase of YouTuber Felix Kjellberg, known as PewDiePie. The term gained global notoriety during the high-stakes subscriber race between PewDiePie and the Indian music label T-Series in 2018. Felix coined the term to mock critics who questioned the maturity of his audience, leading millions of fans to proudly identify as '9-year-olds' regardless of their actual age. The meme represents a sense of community, digital loyalty, and the chaotic energy of early YouTube culture. It is commonly used to rally fans for online 'battles,' share inside jokes from the channel, or celebrate the lasting legacy of the Bro Army.