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 table_name_40 (opened INTEGER, line_name VARCHAR, last_extension VARCHAR)

### Question ###
What is the average opened year of line e, which had their last extension before 2003?

### Accurate SQL ###

SELECT AVG(opened) FROM table_name_40 WHERE line_name = "line e" AND last_extension < 2003