Before revision: See also Similar concepts include: Christian: Six Ages of the World, Dispensationalism Hindu: Yuga Cycle (Satya, Treta, Dvapara and Kali Yuga) Buddhist: Three Ages Jain: Utsarpiṇī and Avasarpiṇī Aztec: Five SunsGiambattista Vico's ricorso: the return of the society to a relatively more primitive conditionJRR Tolkien's fictional "Four Ages"Oswald Spengler's Civilizational model Modern archaeology: Three-age system (Stone, Bronze and Iron), with each of the stages further divided into substages (e.g.
After revision:  Christian: Six Ages of the World, Dispensationalism Hindu: Yuga Cycle (Satya, Treta, Dvapara and Kali Yuga) Buddhist: Three Ages Jain: Utsarpiṇī and Avasarpiṇī Aztec: Five SunsGiambattista Vico's ricorso: the return of the society to a relatively more primitive conditionJRR Tolkien's fictional "Four Ages"Oswald Spengler's Civilizational model Modern archaeology: Three-age system (Stone, Bronze and Iron), with each of the stages further divided into substages (e.g.