|"According to Vedic system one's life is divided into four parts. That is human program. Suppose one lives for hundred years. It is calculated that a man can live up to a hundred years, although the duration of life is now reducing. So taking into consideration that a man lives for a hundred years, so life is divided into four parts, namely brahmacārī, student life; then gṛhastha, household life; then vānaprastha, retired life; then sannyāsa, renouncement. This is Vedic system."