The age is different for everyone and can vary greatly. There are a lot of factors that have to be taken into concideration such as if you are on any sort of hormone treatment, if you have had your ovaries removed, what your natural hormone levels are, physical condition, stress, psychological issues, your attitude towards sex, etc. I think there is a national average age, but I will have to look that up as I do not know it off the top of my head.