Origin and Etymology of is. Middle English, from Old English; akin to Old High German ist is (from sÄ«n to be), Latin est (from esse to be), Greek esti (from einai to be)
For the medical journal, see Menopause (journal). Menopause, also known as the climacteric, is the time in most women's lives when menstrual periods stop permanently, and they are no longer able to bear children. Menopause typically occurs between 49 and 52 years of age.
It's normal for semen volume to decrease as a man ages. Several studies have shown that the volume of semen per ejaculation decreases continuously between ages 22 and age 80. The reason you probably never noticed this before is that the decline in semen production happens so gradually.