How can I delete my old questions (even those with answers)?

You cannot if they have answers. 

Once your question gets answered, it is already considered to be part of the community. In this case, you can only delete questions without an answer. 

WHY WORRY ABOUT IT?? WE CANT SEE OUR BEST ANSWER EMAILS ANYMORE UGH...

You cannot. The site was designed to be a database of knowledge and experience. Allowing users to delete answered questions defeats that purpose. 

you can only delete old questions if you do not have any answers, if their is one answer, you can not delete the question

Same as every other time a mindless troll asks this question over and over, you can't.

you can only delete your question if it has no answers on it if there are

no answers on it to delete it click on the x delete question button under the

blue edit menu once there is answers on it you wont be able to delete it

unfortunately

The ones that have Answers on them your stuck with those there is no way you can get it Removed Yahoo no longer Honors Delete Requests  

Once a question has answers....it becomes the property of Yahoo,  and you can't touch it............unless you have a slew of sock puppets and report it and get it removed that way. 

If the question has answers, the only real way to remove them is as violations. You will need to get friends and network to report. The easiest thing to do is go to the question and change the asker to anonymous. You will then be the only one who knows it is you. The staff in the past would remove one or two, but no longer.

You can only delete them if they have no answers. Click on 'Edit' beside your question and then delete it. If it has an answer the Edit button no longer appears and you cannot delete it.