Question

how is menarche different from 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.

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Answer 2

menarche is begging of mensuration (in teenage)
while menopause is end of mensuration (btw 45-55)