Is part-time teenager labor the same as low skilled labor? In general but also more specifically to the time period you were referencing? While teenagers gene

Is part-time teenager labor the same as low skilled labor? In general but also more specifically to the time period you were referencing? While teenagers generally have low experience, some of them are have the ability to perform at a level above low skill and are able to follow complex instructions. Look at any of them in more advanced classes who are performing academics at a level beyond what would qualify as low skill. These could've been the teenager running the machines at those mom and pop shops of yesteryear. It does lead me to question where are they working now and why not at McDonald's. Given a moment of thought I've already generated a number of hypothesis that might explain it, but I'm too lacking in relevant data to narrow them down.