As others have indicated here, looks like older ones are gone. I ended up writing custom rotation scripts that ran daily so that we could keep apache logs for longer periods for analysis. The only trick was you have to restart apache right after you rename the files.
Also of course, if you are doing what we did and naming files with a date pattern like YYYYMMDD, I reccommend you start the rename script slightly after midnight, not before. This is counter intuitive as then files are named "wrong", but if your script is like mine was and has to get many huge logs rotated and gzipped from lots of websites, it can take some time. You just don't want any ambiguity in what day exactly your script will be getting it's datestamp- if on Monday it runs and load is low and it gets a datestamp at 23:59, but Tuesday load is really high and it gets its datestamp at 00:01 - well, the problem is that Wednesday's logs are going to overwrite Tuesday's logs in the worst case, or just fail to rotate. So just plan to always run the thing just after midnight so you know you aren't going to have this problem.