First things first, if you don’t want to shave your vulva you don’t have to! You should do whatever makes you happy and comfortable.
There is no age when it suddenly becomes necessary to shave, wax or otherwise remove your pubic hair. People develop and grow at very different rates and so the time when one person may feel it’s necessary to start ~ grooming ~ down there will differ from person to person.
However, there is no reason, from a hygiene point of view, to remove any of the hair on your body, pubic hair being no exception.
I hope this was helpful, anon.