Menopause is defined as the absence of menstruation for at least one year, and this is a situation that usually occurs around the age of 51-52. We talk about early menopause when it occurs before the age of 40.
Although menopause is the final consequence of functional ovarian failure, and therefore it can be expected to happen over time, there may be a paradox that ovarian failure exists but that menstruations still occur with a certain regularity. It’s what we call occult ovarian failure.
Therefore, although related, both concepts cannot be confused since the definition of menopause is very specific and concrete.