This chronology is a timeline of events that happened before the show began.



  • May 7, 1974: Stuart is born


  • February 26, 1980: Sheldon and Missy are born
  • May 17, 1980: Leonard is born
  • March-September 1981: Howard is born
  • October 6, 1981: Raj is born
  • 1985: Sheldon's grandfather, Pop-Pop, dies
  • December 2, 1985: Penny is born
  • June 23, Between 1984 and 1987: Bernadette is born
  • December 17, between 1979 and 1985: Amy Fowler is born
  • 1986-1987: Leonard, six years old at the time, walks in on his naked parents and his mother is swatting his father with Leonard's new ping-pong paddle


  • 1991: Sheldon starts college at age 11
  • 1994: Sheldon graduates from college at age 14
  • 1994: Sheldon's father dies
  • 1995: Sheldon attends Comic-Con to meet Wil Wheaton; when Wil doesn't show up, this fuels Sheldon's longtime hatred for him.
  • 1996: Sheldon receives his doctorate.
  • 1997-1998: Penny rebuilds a tractor engine all by herself at age 12


  • Sometime this decade: Stuart came to Pasadena and opened up the Comic Book Store.
  • 2000: Amy begins training in the field of neurobiology
  • 2003: Sheldon and Leonard meet for the first time; the duo also meet Howard and Raj
  • 2003: The Elevator to the Apartment Building is destroyed
  • 2004: Leonard earns his doctorate and officially becomes a doctor.
  • 2003-2007: Penny moves to Pasadena, starts dating Kurt, and gets a job at The Cheesecake Factory
  • September 22, 2007: Leonard and Raj created an idea involving the conversion of footsteps into electromagnetic energy to make it possible for one to recharge their cell phone while walking.
  • Before September 24, 2007: Penny breaks up with Kurt

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