What do you suggest if i am 16 and want to start shaving down there but i'm just wondering, how fast do your pubes grow back?

Variable: Hair growth rate is extremely variable. Just think of how some men have beard shadow by end of day and yet others are smooth for days. You probably have the best idea of how fast your hair grows. How often do you have to shave underarms and legs? Gives you at least an idea.When shaving pubic region, be very careful about using a NEW razor and being clean - I see lots of abcesses from this practice

It depends: Just like any other hair on your body, your pubic hairs may grow at different speeds than other people's. There is no way to actually know in advance.