It does sound like a perfect first job. I imagine you felt proud of yourself then, you seem to feel proud of then-you today.
I will be 71 in a few months.
I had to train cashiers for 25 years. A statistic I once heard said that among every four employees, three of them stole. One took time by falsifying time cards, one took product, and one took money. One was honest. This seems right to me after all the years I was a manager/owner of a variety of food businesses.
If I were to open a business today (god forbid) I would go back to the simplest cash register I could find. I now know that the more bells and whistles on a gadget, the more time you have to spend using/fixing/getting-to-know it. They are surveillance technology, too.
I guess that helps to explain why the store wanted to keep me. Plus, I was really nice to the customers. I seem to be afflicted with a very strong work ethic--even when I hated a job. There were a few of those :).