Conversation so far:
Where was Matthew Boulton born?
CANNOTANSWER.
Where did he grow up?
the family moved to the Snow Hill area of Birmingham.
Did he have any siblings?
The Boultons had three daughters in the early 1750s, but all died in infancy.
What was his upbringing like?
At the age of 15 he left school.

Question: Why did he leave school?
Self-contained rewrite: Why did Matthew Boulton leave school?