Really. If you consider by years, I'm already 20. That's a very mature age, I believe. I know that many a times people still live inside their fun and kiddy kind of attitude in life, who doesn't? Like example, in times like people passing away and stuffs, one would be more ripe and perhaps grow up a little more?
It is usually not easy to grow up and be good all the times, people do go wrong sometimes. To err is human, no? Life experience? I don't dare to take up a big post of it, but still that's 20 years.. so maybe 1/4 of my lifespan? I think growing up is really about people and yourself. If you are considerate and thoughtful towards people and their feelings, I really felt so inferior to you, cause I think I'm still learning that. About how to treat people better and how to make things better for them.
What about things or accidents that happen towards you that have such a huge impact on you? How will one face it? I guess different people will do and handle it differently and whether they did it well, I guess only God know. Life is so much unpredictable.
Having a good attitude towards life, learning the things about life and going through sadness and downs in life? It's all part of growing up, I believe.