Under a mile isn't far at all, a teenager should be able to walk that with no problem.
As long as it's a safe route, I 110% agree.
My 14 yo daughter has about a mile to walk for school....but since more than half of that mile is through trees, sticker bushes, and a field that they don't mow, I'll be driving her.
The alternative is for her to walk down the highway with no shoulder or sidewalk.