It depends. Mine were 34d, I was just lucky. (: Everyone matures differently. Some don't go through puberty until 16 or 17. Don't worry about it.
12-14
Age 12-15
Not at all :)
It really depends on your growth rate. I'm 12 and I have small boobs perking up. Everyone grows at a different rate!
I'm pretty sure that breasts don't shrink unless you have a reduction surgery, so if you're talking about yourself you should be fine.
It depends give them time
Ages 12 to 15 sometimes at ages from 16 to 18
They will probably never be c. I am 12 and am a 34a. Everyone is different. Your size doesn't matter.
No
No! Sex should not be a thought at the age of 12...
you should be at least 12 years old.
At age 12 you should be hooking up your X-box to your television.