The average age at which human females reach menopause is............ (in $years$)

Cessation of menstrual cycle in the human female is known as

At which phase, both $LH$ and $FSH$ attain a peak level?

Ovulation in the human female normally takes place during the menstrual cycle

The diagram below shows various events during the menstrual cycle. Identify the hormones $P, Q, R,$ and $S$.

The first menstruation is called $........$,and in humans,the menstrual cycle ceases around the age of $50$ years,which is termed as $........$.