I meant ones which have not expired since their original registration date.
FYI this is what is commonly referred to as a 'dropped' domain.
If you Google around you'll see lots of advice saying not to buy dropped domains as they dont hold PR etc
That is simply not true in my experience and after buying over 100 aged domains in the past year I now ONLY buy dropped domains because they are 15-30% cheaper and it makes no difference at all as long as the backlink profile is right.