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
What are the issue dates of volumes associated with the artist aged 24 or older?
select issue_date from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id where t1.age > = 24
How many weeks on top for volumes associated with the artist aged 24 or older?
select count ( weeks_on_top ) from artist as t1 join volume as t2 on t1.artist_id = t2.artist_id where t1.age > = 24