The phrase "dependent age" refers to a time in someone's life when they are reliant on the care and support of others. It is often associated with childhood and old age. There are several synonyms that can be used to describe this phase of life. "Childhood" is a common term used to describe the early years of a person's life when they rely on their parents or caregivers for everything. "Youth" can be used to describe the teenage years when someone is still gaining independence but might still need guidance from family or mentors. "Elderly" or "senior" are often used to describe the latter part of one's life, when they require assistance and support from others.