What is the age when a small boy/girl become a Big boy/girl?  

Sperm came out=P
According to Islam a boy wil get bigger when He reach at 15 years While girl is considered to be grown at the age of 12.

Since I am a girl, I will answer that way. I guess when I knew I wasn't a little girl anymore, is when I found out I was going to have a baby. I did alot of growing up in those 9 months, got a job, finished high school, had the baby and then got my own apartment. I was all grown up, I thought, haha. I still had alot to learn. Now I am realy grown up, I have grandchildren.

One day was very unusal and strange for me. Some thing had happend to me and I was unknown. So I shared this one of my elder in family, then I was told that this happens at this age..and after few months I realized I am lil grown up.

when you have hair place you never though of lol, or you voice change to deeper, than there you going taller and bigger,and than you become fatter, lol or when your parents start giving your more responsbiblty and more stuff to do and take care of, or they give you money to tell you go and buy stuff for them. like smoke lol

Sometimes I still have a hard time seeing myself as grown up and I am 45 y/o. Part of me still feels like a child even when I look in the mirror and see new wrinkles.