What are the issue dates of volumes associated with the artist aged 23 or younger?
SELECT Issue_Date FROM artist AS T1 JOIN volume AS T2 ON T1.Artist_ID  =  T2.Artist_ID WHERE T1.age  <=  23
SELECT Issue_Date FROM artist AS T1 JOIN volume AS T2 ON T1.Artist_ID  =  T2.Artist_ID WHERE T1.age  <=  23
[{'Issue_Date': '6 June'}]