Mooncalf gives some good advice.
Each person matures and grows at their own pace - so essentially being an adult is a question of character rather than being a certain age. Adulthood seems to be mostly a focus on responsibility and an understanding of the social contract in which you now fully partake - you're legally and economically culpable for yourself in technical terms.
If I could distil my experience of adulthood into a single aphorism, it's that you're only really an adult when you stop asking whether or not you're an adult yet. By virtue of that, it's not something that you can force - attempting to 'be an adult' is only to wear a mask. By virtue of that, you probably know a fair few 30-somethings that are still children and a few teenagers that are adults.
Each person matures and grows at their own pace - so essentially being an adult is a question of character rather than being a certain age. Adulthood seems to be mostly a focus on responsibility and an understanding of the social contract in which you now fully partake - you're legally and economically culpable for yourself in technical terms.
If I could distil my experience of adulthood into a single aphorism, it's that you're only really an adult when you stop asking whether or not you're an adult yet. By virtue of that, it's not something that you can force - attempting to 'be an adult' is only to wear a mask. By virtue of that, you probably know a fair few 30-somethings that are still children and a few teenagers that are adults.