You know I think that late menopause happens when certain women produce more oestrogen than others for longer. It could be genetic, it could be to do with cycle length in adulthood, diet, weight, or other as yet unknown factors. I don't think I am ovulating any more, but am still making plenty of oestrogen in a haphazard sun flare sort of situation with some quiet periods, and then all hell breaks through with high oestrogen symptoms. I know that oestrogen doesn't fall to a flat level until 1-2 years after the last period, and for us that may well be some time away.
When I am having oestrogen surges it is just like having PMT, which is why I think I am going to have a period, but then it stops abruptly overnight and calm days return. All a mystery, but probably why my great gran had 14 children, one of which was born at aged 49 I believe.I feel like I am hovering just below the threshold where ovulation would occur.
I also wonder if there is a relationship between those suffering with severe PMT and late menopause, as I had this all my life. I really was a mess in the days leading up to a period, so my body is very sensitive to hormone changes leading to migraine and bloating to mention but two of the miseries that resulted.
I still feel very blessed however, and very much aware of the sadness caused by the opposite- early menopause, which is so tragic for women who want a family or who go onto suffer with post symptoms so severely.