First period of females is termed as Menarche.
It occurs at ages between 13 to 16.
An increase in bone mass is there during menarche.
While menopause is the end of periods or can say reproductive life of a female.
A decrease in bone mass is there during menopause.
It occurs at ages between 45 to 55.
Final Answer :
Hence, Menarche is first period and menopause is end of periods.