Why does it hurt after you shave your pubic hair?
Maybe without recognizing it, while you shave you scratch your pubic skin...who knows.. == ==
There is no age limit on shaving your pubic hair, if you're old enough to have pubic hair then you can shave. It should however be noted that pubic hair shouldn't be shaved as it's there to help protect the genitals and shaving risks various problems including ingrown hairs or cysts. Pubic hair is there for a reason, there is absolutely no need to shave your pubic hair.