Question

what do you mean by menarche and menopause

Answer 1

The start: Menarche is the name given to the first menstrual period, which usually occurs between the ages of 11 and 16. The end: Menopause is that point in time when periods stop permanently. It is also called the "change of life" or "climacteric". Hormones are the boss of this process.

Answer 2

the starting of the of menustration is called menarche. its starts from 13 years
the menopause is nothing but the menustration will stop at 50 to 55 years