At What Age Can a Woman Become a Nun? Welcome to our “Ask The Nun” series of informal videos. Today’s question focuses on the age requirement for becoming a nun. Sister Norma Raupple shares her answer. A woman needs to be least 18 years old before applying to join the discernment process. It’s good to have some life experience as a young adult… either going to college or working at a job for a while. During these years there are many ways to be in contact with Sisters. There are opportunities to get to know a group of Sisters and for the Sisters to get to know you… before you actually become a member of the community. Women today are finding that they are attracted to becoming a nun later in life. One can become a nun at almost any age. Please submit your questions to [email protected]