I am soon to be 47, and a few years back I thought I was having a worsening of my PMS symptoms. I have come to find that the PMS symptoms were perimenopause instead. Most people are familiar with Menopause, which is the cessation of a women’s monthly cycle, but not perimenopause. Perimenopause usually occurs in women between their 30’s to late ’40s. During this time, a woman may experience a vast array of symptoms. Most women will enter menopause by the age of 50.