I read somewhere that, on average, women who start earlier also stop later, while those who start later will stop earlier, which makes no sense to me, but seems to have been true in my case. My periods didn't start until I was 13, about 13 1/2 actually, and by the time I was 51, I was done. I'll be 54 next month () and I've been post-menopausal for about 3 years. Jeez, it's nice to be done with that.
I've had a little in the way of hot flashes, mood swings, and sleepless nights, but never anything bad enough for me to consider HRT. But here's the strange thing: I continue to have some symptoms of pms occasionally--maybe every 3 months or so. No blood, but some of the other indicators: headache (which I never get otherwise), mild cramping, fatigue, even mood swings sometimes. My doc says my system's probably still pumping out some residual estrogen now and then. Weird, eh?
I guess some of this is hereditary. According to a maternal aunt, my experience is pretty typical for the women in my family. Can you ask your mom or maybe an aunt?