In the Krsna consciousness movement there are many young couples engaged in the Lord's service. Eventually they are supposed to take vanaprastha, and after the vanaprastha stage the husband may take sannyasa in order to preach
"Nārada Muni then advised the hunter, 'Return home and distribute whatever riches you have to the pure brāhmaṇas who know the Absolute Truth. After you have distributed all your riches to the brāhmaṇas, you and your wife should leave home, each of you taking only one cloth to wear.'"
This is the process of renunciation at the stage of vānaprastha. After enjoying householder life for some time, the husband and wife must leave home and distribute their riches to brāhmaṇas and Vaiṣṇavas. One can keep his wife as an assistant in the vānaprastha stage. The idea is that the wife will assist the husband in spiritual advancement. Therefore Nārada Muni advised the hunter to adopt the vānaprastha stage and leave home. It is not that a gṛhastha should live at home until he dies. Vānaprastha is preliminary to sannyāsa. In the Kṛṣṇa consciousness movement there are many young couples engaged in the Lord's service. Eventually they are supposed to take vānaprastha, and after the vānaprastha stage the husband may take sannyāsa in order to preach. The wife may then remain alone and serve the Deity or engage in other activities within the Kṛṣṇa consciousness movement.