If we raise the driving age other people on the road might think that they are safer because they are older and more maturer at the age of 18, kids are usually responsible and are able to handle things like being on the rode with other people.
If the kids that don't have a drivers licence then who will bring them there. When you have plans with your friends and you don't have your drivers license its hard to get places if you parents are busy. And depending on the time of season it is, it's harder to walk or bike there if it is in the middle of winter because of the snow. And then it's harder to be with your friends if you don't have your drivers licence.