"100 Years" is a song by American artist Five for Fighting. It was released in November 2003 as the first single from the album The Battle for Everything. The song's melody is borrowed from "Plainsong" by The Cure, originally released in 1989.

The music video was directed by Trey Fanjoy and premiered in January 10, 2004. It placed at number 30 on VH1's Top 40 Music Video Countdown of 2004, spending 18 weeks on VH1's weekly Top 20 countdown. In the video, images of Ondrasik singing and playing the song at the piano are intercut with fictional, idealized versions of himself as a 15-year-old boy, a man in his middle 40s, and a 99-year-old man, reflecting the song's lyrics. At the end of the song, Ondrasik meets his older self.

In December 2004, on the Billboard Year-End Hot 100 singles of 2004 chart, "100 Years" was ranked at number 77 for the year, though it peaked at number 28. "100 Years" was also the longest-running number-one single of the year on the Billboard Adult Contemporary chart, staying at number one for 12 non-consecutive weeks.

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