Which life stage is often defined by managing priorities, having children, and starting a career?

The answer is: Early adulthood.

Explanation:

In physical and psychological terms, adulthood is a stage of development in which physical, emotional and psychological stability is regained after the hormonal and physical changes experienced by a person during adolescence. However, adults see changes in the way they experience the different areas of life, depending on the stage of adulthood in which they are, depending on their age. As such, early adulthood is the first step, and it comprises people who are between the ages of 20 to 35 years. These are not only the most productive, but also the most reproductively-speaking efficient years. Although no longer at the mercy of hormonal imbalances, people in early adulthood do experience a lot of changes as they face different facets of life, like having children, establishing deeper romantic relationships and managing careers. These changes will start to balance themselves as the person reaches middle (36 to 65), and late adulthood (65 and older).

Adulthood is the answer