Wear & tear on shoes and replacement

I definitely notice when mine break down, but I should say that I haven't tracked mileage in the past, and I'm a stop-and-start runner. I just replaced the shoes I bought 3 years ago, and the minimalist pair before that was 7 years old. But there was a distinct line between shoes that were OK and ones that needed to be replaced.

I get between 200-300 miles out of any pair. At about 200 I start to feel it and by 300 they are dead.

I feel it the next morning. I'm much more sore in my calves and really feel it on stairs!