What is the proper age for a girl to have a boyfriend and why?

what do you think the proper age is to have a boyfriend beacuse all of my friend have a boyfriend and i dont, I just think it knd of weird.

My sister says around 13–18 but im not really sure. I want a boyfriend but I dont know if im old enough or too young to have one yet.

My freinds say its the perfect age to have one, but i just dont know. What is a good age to have a boyfriend and why?