The phrase is often used to describe a person, a group of people, or an organization that has grown or developed to a point where they are considered fully mature or capable.

The idiom "come of age" is typically used to describe a person, group of people, or organization that has reached a significant level of maturity or development.
For example, it might be used to describe a teenager who has reached the age of majority and is now legally considered an adult, or a company that has grown from a small startup to a successful and established business.
It can also be used to describe a specific event or accomplishment that marks the transition from adolescence to adulthood, such as completing a rite of passage or achieving a significant milestone.
Here are sample sentences using the idiom "come of age":
- She's finally come of age and ready to take on more responsibilities.
- After years of hard work and dedication, the company has finally come of age.
- He's been through a lot, but he's come of age and is stronger for it.
- The team has come of age and is now considered one of the best in the league.
- She's always been a talented artist, but she's really come of age in her latest exhibition.
- The country has come of age and is now considered a major player on the global stage.
- The novel is about a young boy coming of age in a difficult environment.
- This new album shows that the band has come of age and is ready to take on the world.
- The company's success is a testament to how far it has come of age in the industry.
- His victory in the tournament shows that he has truly come of age as a competitor.
It is important to note that the idiom is often used in a figurative sense and does not always refer to a specific age or event. It can also be used to describe a person or organization that has grown or developed in a particular way, such as gaining a new level of experience or expertise.
The phrase is used in a sentence like: "After years of hard work and dedication, the company has finally come of age" or "John has come of age and ready to take on more responsibilities"