Task: Text to Code
Input (English): SQL: SELECT Avg ( Famous_Release_date ) FROM artist WHERE Artist = "Gorgoroth" OR Artist = 25
Feedback: Replace famous release date with average weeks on top of volumes table , age equal or lower than 25 , remove last part .
Output (English): SELECT avg(T2.Weeks_on_Top) FROM artist AS T1 JOIN volume AS T2 ON T1.Artist_ID  =  T2.Artist_ID WHERE T1.age  <=  25