I'm talking about the old series (haven't really seen the new one, but it may apply to that too).
Okay, it's established at the forefront that the Human-Cylon war has been going on for a long time. I could swear I heard somebody say that it's gone on for at least
3000 "Yarens." And yet there are a few episodes where characters (mostly the older ones) comment that they "remember what life was like before the war."
A bigger evidence, though, is that this rag-tag fugitive fleet has no problem crossing lightyears
of space without going at light speed (they're specifically avoiding that for the sake of the slower ships, and to conserve fuel). And yet, they apparently are
getting closer to Earth as the series goes on, if the final episode "The Hand of God" is to be believed. The only explanation that makes sense, then, is that people from the twelve colonies have lifespans many times the length of your average Earthling—our lives are probably the blink of an eye to them!
So, what do you think?