I don't think they have any basis in reality except that they seem to have influenced our way of thinking since the beginning of civilization. The symbology of the astrological ages and the calendars based on them tells me that they had a some kind of impact on humanity. I understand that scientific knowledge was still a squint in humanity's eyes back then, but they were still a drive that made humans do many crazy things and continue to do so.
So this is why I am asking if this is part of the evolutionary process.
I guess I'll be more specific and mention the piscean age, the coming of the so called age of aquarius and the Christian apocalypse.