If you were born on Monday, May 11, 1942 then When I Need You by Leo Sayer was the number one on your 35th birthday, and went to number one on May 08, 1977. Check the price of When I Need You by Leo Sayer on Amazon.com
The biggest selling book of 1977 (the year you turned 35) was The Silmarillion by J.R.R. Tolkien and Christopher Tolkien.