1. Infancy: From birth to about seven years old, when children are largely dependent on their parents or guardians.
2. Childhood: From about seven to fourteen years old, when children become more independent and start to learn and explore the world around them.
3. Youth: From about fourteen to twenty-one years old, when individuals begin to take on more responsibilities and may start to pursue higher education or careers.
4. Adulthood: From about twenty-one to forty years old, when people typically establish themselves in their careers and families.
5. Middle Age: From about forty to sixty years old, when people may experience a sense of accomplishment and stability in their lives.
6. Old Age: From about sixty to eighty years old, when individuals may begin to experience physical and mental decline.
7. Senescence: From about eighty years old onwards, when individuals may require assistance with daily activities.
Jaques' line suggests that human life is like a play, with different characters (men and women) playing different roles (ages) as they progress through life. The seven ages represent a common understanding of the different stages of human life, from birth to old age, and how people's roles and responsibilities change as they age.