If I have notice I would be ok with the age. If the parents feel the teenager can handle the responsibility it is not my place to interfere. However she would need to be added to thier pick up list. I have all parents keep a list of people autorized for pick up on file here. They need to tell me ahead of time (even just a text or call that day is fine) and the first time I meet someone I check ID at the door. I think texting a picture of the person is a bit extreme, but you have to feel comfortable with your system.