Brahma, the creator god, designed various life forms and their roles in the ecosystem. He gave humans a lifespan of 25 years to learn and provide for their families. However, some animals and humans complained about their allotted lifespans. Brahma agreed to redistributed years from other lifespans to appease them. He gave humans a four stage life of 25 years each: student, householder, retirement, and renunciation. Brahma emphasized using wisdom to make the most of one's life.