Antediluvian \an-tih-duh-LOO-vee-uhn\ ;
1. Of or relating to the period before the Biblical flood
2. Antiquated; from or belonging to a much earlier time
1. One who lived before the Biblical flood
2. A very old (or old-fashioned) person
I like ante- as an affix because it, in and of itself, seems quaint and old-fashioned, which is what it's meant to convey.
According to Etymonline.com:
The word dates back to the 1640's and comes directly from Latin: ante- + diluvium = "before" + "a flood." This word is interesting because the man who coined it is actually known. His was an Englishman named Sir Thomas Brown, and he was a Physician who lived in the 1600's.
*Today's word and the first definition were both taken from Dictionary.com's 'Word of the Day' for Wednesday, October 20