This document discusses the human lifespan according to the Hindu ashram system of life stages. It divides life into 4 stages: Brahmacharya (student stage from birth to age 24), Grihastha (family/married stage from age 24 to 48), Vanaprastha (retired stage from 48 to 72), and Sannyasa (renounced stage from age 72 until death). Each stage has different responsibilities, with the early stages focused on education and family, and later stages involving retirement, detachment from family, and devotion to spiritual pursuits. The ashram system provides a framework for the natural progression and duties at different phases of life.