I never said it happens "all the time". My comments were in response to your post that there was "no chance". I was simply stating that it was possible. And therefore, drivers should ask if the customer appears to be anywhere close to the age cutoff.
I really don't understand why you believe so strongly that could not happen. People do (at least occasionally) mistake 12-13 year olds for young adults. I have experienced it numerous times and know plenty of others who also have. Just this Tuesday my son was asked in my presence if he was a graduating senior (he just turned 13 two weeks ago). When we first moved here my older daughter was mistaken for my husband's
wife on more than one occasion (she was 14). It really doesn't seem so impossible to me for someone to mistake a girl who was about to turn 13 for an 18 year old. That's not a huge leap.
This is a picture of the girl from last year (so she was younger than when the driver picked her up). I would say that she could appear to be anywhere between 10 and 20 depending on clothing, behavior, etc.
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