“Behind us lie fourteen Earth generations of mankind, and this has been the manner of their naming: The Generation of Light, The Generation of Water, The Generation of Grass, The Generation of Trees, The Generation of Wood, The Generation of Stone, and all these together are the Blissful Generations. Then followed The Generation of the Spear, The Generation of the Axe, The Generation of the Shield, The Generation of the Sword, The Generation of the Bow, The Generation of the Helmet and The Generation of the Chariot, and all these together are the Homeless Generations. The years before us contain six full Earth generations and whatever remains of this Generation of Change. Each of the past Earth generations was three times the length of the one, which followed it.”
The Kolbrin, Book of Origins (OGS:1:2)