If you were born on Wednesday, March 06, 1940 then Imma Be by The Black Eyed Peas was the number one on your 70th birthday, and went to number one on February 28, 2010. Check the price of Imma Be by The Black Eyed Peas on Amazon.com
The biggest selling book of 2010 (the year you turned 70) was The Girl Who Kicked the Hornet's Nest by Stieg Larsson.