[Bikash]

Perimenopause, or menopause transition, is the stage of a woman's reproductive life that begins several years before menopause, when the ovaries gradually begin to produce less estrogen. It usually starts in a woman's 40s, but can start in a woman's 30s or even earlier.

Perimenopause lasts up until menopause, the point when the ovaries stop releasing eggs. In the last one to two years of perimenopause, this decline in estrogen accelerates. At this stage, many women experience menopausal symptoms.
The average length of perimenopause is four years, but for some women this stage may last only a few months or continue for 10 years. Perimenopause ends the first year after menopause (when a woman has gone 12 months without having her period).