If you were born on Monday, March 02, 1942 then Ballad of the Green Beret by Sgt. Barry Sadler was the number one on your 24th birthday, and went to number one on February 27, 1966. Check the price of Ballad of the Green Beret by Sgt. Barry Sadler on Amazon.com
The biggest selling book of 1966 (the year you turned 24) was Valley of the Dolls by Jacqueline Susann.