How old are you?

I'm 14, and at the end of this year i will be 15 ;). In november to be exact
 
I'm 14, and at the end of this year i will be 15 ;). In november to be exact
 
Well I'm 900-(40+(-600)-180)+120+(-300) years old. Calculate yourself now. what is my age?
 
Well I'm 900-(40+(-600)-180)+120+(-300) years old. Calculate yourself now. what is my age?