Name the average year for manly-warringah sea eagles
CREATE TABLE table_name_13 (year INTEGER, opponent VARCHAR)
SELECT AVG(year) FROM table_name_13 WHERE opponent = "manly-warringah sea eagles"
### Context: CREATE TABLE table_name_13 (year INTEGER, opponent VARCHAR) ### Question: Name the average year for manly-warringah sea eagles ### Answer: SELECT AVG(year) FROM table_name_13 WHERE opponent = "manly-warringah sea eagles"