These jobs were originally created for teens who were in high school who wanted sneakers and phones, and college students trying to get extra money for books and mess. Times have changed since the recession. Many of these students are being replaced with adults, in many cases college educated adults, who have nowhere else to turn and just need to make ends meet, possibly until they find something more suitable for them.
Less and less people are retiring from their careers at "retirement age", due to the fear of such a scarce funds once they stop working. So this leaves less slots available to people just getting out to college who are ready to fill these positions. Times are changing. But the pay in fast food hasn't. It is time they keep up with the times. Especially considering the HELL these workers go through.