This is my mom's recipe. How old it is is anyone's guess. I grew up on this salad and I am 60 now. Measurements depend on how many people you need to feed. Mom's rule was 2 small to medium potatoes and 1 egg per person. The other measurements I came up with when I started cooking. Mom never measured anything unless she was following a recipe that she wasn't familiar with. Thanks mom for the best potato salad I have ever had.