The other odd thing is that, when I was in HS, driver's ed was a required class. It was a one semester course for sophomores, and you took health the other semester. For some reason, they scheduled me to have driver's ed during my first semester, when I was still 14 (turned 15 about 8 weeks into the semester). I finished the class, but it was another 3 months before I could get my learner's permit (at 15 1/2). My two best friends, on the other hand, had their birthdays in March and April, but they had health the first semester, so they turned 16 and still couldn't get their permits because they hadn't completed the class.
Nowadays, not only is driver's ed not a required class, it isn't even offered at my kids' school, except as an "enrichment" class over the summer (at a cost of $100-something). And, of course, there's the online option.