What song was #1 on your 18th birthday

Go here and type in the day that you turned 18 and it will give you the song that was #1 on that day. According to my good friend Chez Pink aka La Peaches this will be your life's theme song, whatever that means.
Remember, use the day you turned 18, not the day you were born

My results:
US Charts - Mrs. Robinson by Simon and Garfunkel
British Charts - Young Girl by Gary Puckett and the Union Gap

Mrs. Robinson, older woman, younger guy
Young Girl, younger girl, older guy
I am so confused.