How old do you have to be to be a grown up?

The definition of a "grown-up" can vary, but legally, most countries consider individuals to be adults at the age of 18. This age often marks the transition to adulthood, granting rights such as voting and signing contracts. However, emotional and psychological maturity can take longer to develop, and many people may not feel like a grown-up until their mid-20s or even later. Ultimately, being a grown-up is more about responsibility and maturity than just age.