If you were born on Friday, September 11, 1942 then Maniac by Michael Sembello was the number one on your 41st birthday, and went to number one on September 04, 1983. Check the price of Maniac by Michael Sembello on Amazon.com
The biggest selling book of 1983 (the year you turned 41) was Return of the Jedi Storybook by Joan D. Vinge.