Answer: Life and death
Step-by-step explanation:
The "stage" is the world. The men and women being "merely players" is everyone living their lives on the world, having their own purpose in life, but because the world is depicted as a stage, then the men and women are like actors. "Exits and entrances" refers to the death and birth of humans, meaning we were all born once, and will die one day, when our time comes. The seven ages are seven stages in life that we will reach some point in our lives:
1. infant
2. schoolboy
3. lover
4. soldier
5. justice
6. platoon
7. old age
After old age, comes death.
Hope this helped! ^-^