Ovarian aging is a core factor in female aging, leading not only to reduced reproductive function such as infertility, recurrent pregnancy loss and congenital anomalies, but also to perimenopausal syndromes, genitourinary syndrome of menopause and related diseases (osteoporosis, cognitive disorders, cardiovascular disease, etc.). This book comprehensively presents the latest research progress of ovarian aging worldwide, and systematically explain the mechanism of the rise and fall of ovarian function. It will be a valuable reference for gynecologists and practitioner working in ovarian aging.