I suppose "old fashioned" is much more of a subjective measurement than an objective one. At first I was going to rate "snail" as not at all old fashioned, since we still use the word. But then, I thought of medieval snail drawings, and felt like the word has some element to it that does harken back to older days. "Citadel" is kind of a similar example. There is a modern hedge fund named Citadel and we still use that word, but it also has a connection to the past. I'd say Citadel is more "old timey" than "snail" even though both words are in modern parlance.

A better way to think about it is that these measurements are my subjective opinion on old timeyness and sillyness via an undefined and intuitive process for assigning values.