I'm A Banana
Potassium-Rich
It's also why I've always thought the idea that 1st level was the most common level was sort of silly. 1000 xp is pretty easy to get, given enough time, and 3000 xp total is not out of reach of your average life. I've always considered 2nd and 3rd level to be a better baseline upon which to model your average citizen.
The 3e DMG wouldn't disagree with you. 2nd and 3rd level NPC's, according to it, were certainly present (even if 90% of the world was 1st level). I assumed this was mostly because the first battle most NPC's fought happened to kill them, so there's only a few that survive, and more than those few survivors protect.