No. What I meant was that as a neophyte high school runner, 5 minute-per mile marathon pace was something that, at the time, seemed like it might be eventually possible for me, after years of training, say, in my mid-20s or so. In my first few years of running I was on a progression where that at least seemed feasible, but then I hit my genetic limits. 4:38 pace, on the other hand, is something I wouldn't have even dared to dream about.