| Menarche | Menopause |
| Menstruation. It is the first menstruation in the life of a girl. | It is the end of menstruation in the life of a woman. |
| Age. It occurs at the age of 11-13 years. | Menopause occurs at the age of 45-50 years. |
| Reproductive Cycle. It is the begining of reproductive life. | It is the end of reproductive life. |
| Bone Mass. There is increase in bone mass. | There is reduction in bone mass and tendency to osteoporosis. |