The menopause has significant implications in women's life from several aspects. In order to give some suggestion to women's way of life, we studied history obtaining from the records at cancer examination in two institutions, and investigated about the factors influencing natural menopausal age. The results were as follows: 1) The age distribution of menopause was from about 30 to 59, with mean value of 50.0±3.5 (SD). 2) In 1906 to 1932 of birthyears, when the number of pregnancy and delivery decreased gradually, menopausal age unchanged. 3) In 5 geographic areas, where significant differences were found in menarcheal age, marital age, numbers of pregnancy and delivery, menopausal age showed contant value. 4) There exists no significant relationship between menarcheal age and menopausal age. 5) In the group of early marriage before 22 yr old, significant positive correlation was noted between marital age and menopausal age. 6) From the viewpoint of physique, significant positive correlation was found between BMI (adiposity) and menopausal age, excluding women with BMI beyond 25 (upper limit of normal range). 7) Menopausal age tended to show lower in never-pregnant or never-delivered group in physicalworker, in smoker, in non-favorite group of meat, beans and sweets, in favorite group of salt taste, and in gorup used artificial milk for infant rearing, than the opposite group, respectively. As above, menopausal age proved to relate closely to more individual factors rather than social or environmental factors.