I have no idea when I began peri-menopause...it was gradual. I had a couple of very short, irregular cycles right around my cycling accident in '05 (I had just turned 44), but those could have been stress related. Definitely in peri-menopause in my late 40s, but as I mentioned above, my symptoms have not been severe. Shorter cycles are my main symptom. No real PMS.
My last cycle was only 21 days. Frustrating to say the least. I used to know when I needed to carry supplies, now I never know. I still have the occasional 28-day cycle.
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow