A fortunate few have minimal symptoms, but at least three-quarters of women will have some symptoms. One-third are moderately to severely affected.
On average perimenopause lasts for three to four years, usually starting in the mid to late 40s. But for some women it can start as early as the mid-30s.
A UK company is offering women a procedure it says can delay menopause up to 20 years and allow women to delay having babies.
But don’t get too excited.