Adult

Everything became mature, we born, we live and we die. Is Nature law no one can change that.
Every person is diferent because everyone has a special nature or personality.
Adult... for people, is some person that has some age or a mature personality. Today one person is considerate mature or adult with 21 but when this person has 18, is too considerate adult. Adult age is subjective because is diferent for culture of any nation.
Our personality, said some scientists begin when we are inside of our mother because is "the build of our nature". In our teenage our body change, we feel many emotions and is this time that our personality became more stronger. School or family are very important for help build our personality with some values.
Is when we have 21 that our body is "complete" and our adult personality is too complete and for example what our parents of family or friends teach us, now is values that our personality has. Exist people that have a good family that teach always the good values, respect others, fight for their objectives and more but some this people falls is opposite side, some of them, because of their friends. You can see one type of person if you look at her friends, because friends show others what type of people we are, what we identify.
Sex became more important we our teenage because is when is change and for example we can see in this what our nature tells us, (heterosexuality or homosexuality).
21 is important because is one year of our life that we choose away. 21 is important because is when for example our height stop etc... In this age we have complete our adult personality and we have the values that will make a orientation for our life. For monogamous homosexual men this is a important age because is when for example we want make alliance with someone and make a family. Exist two diferent ways: one is find someone for share our life other is the "fun" someone. For who choose the "fun" way maybe dont exist retourn and if someday you change your mind is late because life is short and for example for make a healthy family is need time for find the right partner, time for live together and time for make plans for have a children for example. Make a family is very complex and serious of course for who choose the "fun" way you can make a family, called "friendly family".
Of course life is short and we must pay attention what we choose and we want because can became one way without retourn. If everyone were "easy" or conformist maybe Christopher Columbus didnt find America or for example we dont have Internet because "is need so many work to do.." or the moon never saw the men etc...
Sometimes the easy way became more dificult and confused and we became lost. People who are adult choose their way and deal with consequences. Is the law of life we choose and receive the good or bad that our life has to offers you.