1980s

The following events occurred in the 1980s:

The Big Bang Theory
1985: Sheldon's maternal grandfather Pop-Pop dies
 * February 26, 1980: Sheldon and Missy Cooper are born
 * May 17, 1980: Leonard is born
 * Between March 1st, 1981 and September 30th, 1981: Howard is born
 * October 6, 1981: Raj is born
 * December 2, 1985: Penny is born
 * June 23 1984-1987: Bernadette is born
 * December 19, 1979-1985: Amy is born
 * Circa 1986: Leonard, six years old at the time, walks in on his naked parents and his mother is swatting his father's rear end with Leonard's new ping-pong paddle