I use Blogger and all of my posts since 2006 are there, and in date order, so I'm not sure what you mean. If it's just a matter of taking old posts down without losing them, I have two suggestions. First, go into edit on a post you want off the blog and do a save as draft. If that doesn't work, see what happens if you change the post date to a future date--I think they'd disappear from the live blog, but you'd still have them in storage to repost at a later date with a changed date if you choose.
Yesterday would have been Singing Sumo/Dobie's birthday, and I posted your blog link at JC on the "Sayonara Singing Sumo" thread, since you had mentioned that he was instrumental in getting you to start pouring out the memories.