M south indian.i find some guys really matured and takes responsibilities when compared with their age.do their dna has got something to do with it?

Nature + Nurture: When someone is more mature for their age, it is often the result of their inherent nature interacting with how they were raised. And it's not necessarily all good. Some people are forced to grow up fast because of difficult lives. Rather than idealizing such people, it's good to look at what changes you would need to make in your life and your habits that will enhance your happiness. Good luck.