Vanaprastha - The Hermit in Retreat

"This stage of a man begins when his duty as a householder comes to an end: He has become a grandfather, his children are grown up, and have established lives of their own. At this age, he should renounce all physical, material and sexual pleasures, retire from his social and professional life, leave his home, and go to live in a forest hut, spending his time in prayers. He is allowed to take his wife along, but is supposed to maintain little contact with the family. This kind of life is indeed very harsh and cruel for an aged person. No wonder, this third ashrama is now nearly obsolete." – About.com