Purpose: The purpose of the study was to understand the lived experience of illness among older females with cancer in South Korea. Methods: Data were collected from May to December of 2019 through individual in-depth interviews with eight older females with cancer who have undergone thorough cancer diagnosis and treatments. Transcribed data were analyzed using the hermeneutic phenomenological method developed by van Manen. Results: Six essential themes emerged: old body physically devastated through the fight against cancer; tug of war for symbiosis between cancer and the old body; home that does not provide comfort anymore; twilight years with no regrets even with cancer; womanhood to keep for a lifetime even in old age; and putting pieces together of the relationships around oneself. Conclusion Based on the participants’ illness experience, efforts need to be made to develop and implement effective strategies to improve nurses’ understanding of the life experiences of illness among older females with cancer in the Korean socio-cultural context, and to provide patient and family-centered nursing interventions that reflect patients’ age and gender characteristics.