If you were born on Sunday, February 10, 2008 then Dark Horse by Katy Perry featuring Juicy J was the number one on your 6th birthday, and went to number one on February 02, 2014. Check the price of Dark Horse by Katy Perry featuring Juicy J on Amazon.com
The biggest selling book of 2014 (the year you turned 6) was The Fault in Our Stars by John Green.