Billie was 10 when he met Mike Dirnt in the school cafeteria in 1982. During sleepovers at each other's houses, they played songs by old heavy metal warhorses such as Ozzy Osbourne, Def Leppard, and Van Halen. Other influences would be the "thrash and drang" of the Bay Area's alternative music culture percolating throughout the eighties. Clubs such as Mabuhay Gardens and Berkeley's 924 Gilman Street regularly showcased local groups like the Dead Kennedys and Buck Naked. He wrote his first song, "Why Do You Want Him", a song about his mother and his step father, when he was 14. At the age of 15, Billie, Mike, and a drummer named John Kiffmeyer formed a punk band and named themselves Sweet Children. Their first gig was actually at Rod's Hickory Pit. One day before his 18th birthday, and halfway through his senior year, Billie dropped out of high school (Pinole Valley High School) to devote all his time to Sweet Children. He knew what he wanted to do - play music, and school was just getting in the way. At this point, Billie had the nickname "Two Dollar Bill", referring to the price of the joints he sold.
In 1990, Kiffmeyer left the band to attend college. Billie and Mike were faced with the task of finding a new drummer. They knew the perfect fit, Tre Cool, a Gilman Street veteran, who was then playing in the Lookouts!. Later, Sweet Children was renamed Green Day. Before they knew it, they were traveling all over the country in an old bookmobile with Tre's dad at the wheel. They did all this with little money and staying at fans' houses. It was in Minneapolis in 1990 that Billie first laid eyes on his future wife, a girl named Adrienne Nesser. They dated for some time and then were married on July 2, 1994, a 5 minute ceremony. The day after their wedding, Adrienne found out she was pregnant. Their son, Joseph Marciano Armstrong, was born in March 1995. Three years later on September 12, 1998, another boy, Jakob Danger was added to the Armstrong family. Today, Billie, Adrienne, Joseph, and Jakob reside in Berkeley, California.(Biography source: http://www.greendayauthority.com)