If you were born on Thursday, December 31, 1942 then (Just Like) Starting Over by John Lennon was the number one on your 38th birthday, and went to number one on December 21, 1980. Check the price of (Just Like) Starting Over by John Lennon on Amazon.com
The biggest selling book of 1980 (the year you turned 38) was The Covenant by James A. Michener.