Conversation so far:
How did Berry come up with the song?
after listening to and performing the song "El Loco Cha Cha" with Ricky Rillera and the Rhythm Rockers.
Did it take him long to make it?
CANNOTANSWER.
Did he write it by himself?
San Francisco.

Question: How old was he when he wrote it?
Self-contained rewrite: How old was Richard Berry when he wrote the song Louie Louie?