Mass Prune of threads older then, and not viewed after x days
 

Can someone help me to get a hack which I can use it to delete all threads and posts older than a specific days?

in CP I have "rune by date" which is described as:
Delete threads with last post older than x days

But that seems to not delete the the thread which are older than x days and having 0 posts.

Also if it's possible to get a hack which deletes all threads and posts which belong to threads lastviewed before x days?

vb database structure does not save last view date of a thread so your request is not possible unless you change db structure.