As stated in your letter now you are retired from your job and your daughters are getting married. This means that your grhastha life is almost finished. Therefore, according to Varnasrama Dharma you should spend the rest of your life simply engaged in there devotional service of the Lord. It has been the ancient custom that the man in the later years of his life, usually after the age of 50, prepares to leave home and takes the order of vanaprastha, taking pilgrimages to different holy lands. Then eventually he may take sannyasa, the renounced order of life, with no connection with family whatsoever. This is actually necessary as it is recommended by Sri Krsna Himself.
Letter to Sri Srinivasan, 23 December, 1974