Maybe it's different where you are, but in the Kentucky area I see plenty of people in their 50s and 60s working in fast food, gas stations, and Wal-Marts. Have you really not seen this?
Further, your solution is basically going to get some of those people fired. How about treating the problem of why those people are working minimum wage jobs instead of glossing over it and making things worse.
...Because I know that the position they are working pays minimum wage in my area. Are you just trolling now? Some of them may have been around long enough to earn small raises, but nobody in central Kentucky gets $15 an hour to flip burgers or ring up gas or gather shopping carts.
I live in ND, we have a bit of an economic boom going. I'm not trolling, but you seem to miss the point of a lot of commentators on this post that minimum wage changes are not an answer and only a feel good measure for people who don't take the time to look at the economy. It sounds good, but will have all sorts of backlash. Its a bad idea and treating the symptom, poorly.
Further, your solution is basically going to get some of those people fired. How about treating the problem of why those people are working minimum wage jobs instead of glossing over it and making things worse.