"Thirty-Three" is a term that can refer to various subjects, including a number, a song, or a significant age. In mathematics, it is the integer following thirty-two and preceding thirty-four. It is often associated with various cultural references, such as sports jersey numbers or milestones in life. In popular culture, "Thirty-Three" is also the title of a song by the band Blink-182. The song explores themes of nostalgia and reflection, resonating with listeners who relate to the experiences of growing older. It highlights the emotional journey of coming to terms with life's changes and challenges.