Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_16 (year_named INTEGER, name VARCHAR, diameter__km_ VARCHAR)
### Question:
What's the average year for the name aida-wedo dorsa with a diameter less than 450?
### Answer:
SELECT AVG(year_named) FROM table_name_16 WHERE name = "aida-wedo dorsa" AND diameter__km_ < 450