What is is 6 inches big for a 14 year old?

It depends on what you are referring to specifically as being 6 inches big. Assuming you are referring to the average penis size for a 14-year-old male, according to research, the average length is around 3.9 inches when erect. So, if a 14-year-old male has a penis that measures 6 inches when erect, that would be considered above the average size for their age. However, it's important to remember that everyone's body develops differently and there is a wide range of "normal" when it comes to penis size.