i can delete posts. however, as amma pointed out, we don't do that "just because". posts and topics are only deleted to solve or prevent serious problems.
if you need something specific deleted or edited after your time runs out, you can contact me and i'll fix it for you. :-)
you don't need to delete your old posts. they aren't causing any problems. if Admin starts running out of room, he'll take care of it. :-)