Also, it is not uncommon to be perimenopausal beginning in the 30s, with variable symptoms for many years before menopause.
I had hot flashes and night sweats for a decade before menopause, and irregular periods for about 3-5 years before they finally stopped. Menopause was a happy event for me. No more bleeding, cramps, and inconvenience. I sort of wish it was early!
Jan