Conversation so far:
What are the names of Yoko Ono's parents?
Yoko Ono was born to Isoko Ono and Eisuke Ono, a wealthy banker and former classical pianist.
Did Yoko Ono have any siblings?
Yoko Ono has a younger brother, Keisuke Ono.
Was Yoko Ono interested in music at a young age?
Yoko Ono studied piano from the age of 4 to 12 or 13.

Question: When did Yoko leave Japan?
Self-contained rewrite: When did Yoko Ono leave Japan?