If you were born on Saturday, March 07, 1942 then I Love a Rainy Night by Eddie Rabbitt was the number one on your 39th birthday, and went to number one on February 22, 1981. Check the price of I Love a Rainy Night by Eddie Rabbitt on Amazon.com
The biggest selling book of 1981 (the year you turned 39) was Noble House by James Clavell.