SB 11.17.55
karmabhir grha-medhiyair
istva mam eva bhaktiman
tisthed vanam vopaviset
prajavan va parivrajet
Translation:
A householder devotee who worships Me by execution of his family duties may remain at home, go to a holy place or, if he has a responsible son, take sannyasa.
Purport:
This verse describes the three alternatives for a householder. He may continue at home, or he may take vanaprastha, which involves going to a sacred place with one’s wife. Or if he has a responsible son to take over his family duties, he may take sannyasa, the renounced order, for a definitive solution to the problems of life. In all three asramas, ultimate success depends on sincere surrender to the Supreme Lord; therefore, the most important qualification one can have is Krsna consciousness.