Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE driver ( home_city VARCHAR, age INTEGER )

### Question ###
Show all home cities except for those having a driver older than 40.

### Accurate SQL ###

SELECT home_city FROM driver EXCEPT SELECT home_city FROM driver WHERE age > 40