finalizing mixing the album when the song debuted. The song did best on Billboard Modern Rock Tracks chart; the song first entered the chart during the week of May 8, where it debuted at number 21. It first hit the top five during the week of June 5, and hit number two on July 24, where it remained for ten weeks behind the Red Hot Chili Peppers' "Scar Tissue". The song crossed over to mainstream radio in mid-1999, where it debuted at number 71 on the Billboard Hot 100 on July 17. It later peaked at number 58 in the issue dated October 23. The song had previously peaked at number 51 on the Hot 100 Airplay chart on September 11. In the United Kingdom, the song was released twice, first on September 20, 1999, and again on June 26, 2000, following the success of "All the Small Things. The 2000 re-release peaked at number 17 on the UK Singles Chart. Critical reception Carrie Bell at Billboard deemed the song a "peppy punk anthem" while Spin columnist Jeffery Rotter called it an "ideal tonic for back-to-school nausea." A Kerrang! writer called the song "ridiculously infectious," while the New Musical Express (NME) derided the song as "more mindless, punk-pop guitar thrashing from the world's current favorite American brats ... on the plus side, the song — much like Blink-182's career, we hope — only lasts for two-and-a-half minutes." Stephen Thompson, writing for The A.V. Club, complimented its catchy sensibility, remarking, "you'll never go broke creating an anthem for immature post-adolescents, even working within a well-worn genre." Later reviews have subsequently been positive. Jon Blisten of Beats Per Minute deemed it one of the record's "finest songs," calling it a "twisted, self-depreciating examination of man-children." In 2014, Chris Payne of Billboard called it "the quintessential Blink manifesto — the story of a twenty-something who still acts like a child." The website Consequence of Sound, in a 2015 top 10 of the band's best songs, ranked it as number six, with writer Collin Brennan observing that its title is "the question underpinning the entire Blink ethos". Music video Filming The music video for "What's My Age Again?", directed by Marcos Siega, features the band running in the nude through the streets of Los Angeles, as well as through commercials and daily news programs. It was filmed shortly after completing the album, and was