You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: BILLBOARD NO. 1 HITMAKERS 
Clue: In May 1964 this New Orleans native was 62 years old when he bumped the Beatles' "Can't Buy Me Love" from the No. 1 spot
louis armstrong