I have a 19 year old nephew. He still acts like he is 10 in some cases. I can't see him as adult nor his decisions in life looks like an adult. 19 is so young a

I have a 19 year old nephew. He still acts like he is 10 in some cases. I can't see him as adult nor his decisions in life looks like an adult. 19 is so young and still mentally child in many cases.