Conversation so far:
When was Steven Vai born?
a descendant of Italian immigrants, was born in Carle Place, New York.
How old was Vai when he became a musician?
CANNOTANSWER.
What did Vai do before becoming a musician?
It was a year later, at the age of six, that Vai experienced his first introduction to the guitar.
Is there anything else interesting in this article?
When I saw that guitar and I saw this kid playing it, I knew instinctually that I was going to play the guitar someday.
Where did Vai grow up?
New York.
Did he attend college?
Vai attended Berklee College of Music.
What did he do after college?
in the middle of his fourth semester, moved to California to start his career as a session and touring artist for Zappa.

Question: Was he an only child?
Self-contained rewrite: Was Vai an only child?