Conversation so far:
Where was Mike born?
Stock was born in Margate, Kent, England.
Who are his parents?
CANNOTANSWER.
Does he have any siblings?
CANNOTANSWER.
What was his early life like?
At Swanley school he was involved in several school variety productions.
He was self-taught in playing the piano and guitar and began writing songs at the age of seven.

Question: When did he begin performing music?
Self-contained rewrite: At what age did Mike Stock begin performing music?