Long time ago
I kind of expected to run faster because I let a guy outkick me and felt that I had a few more seconds but just didn't put in that extra effort that day. Thing is, it was a fast course. I ran to within a few seconds of that a year later on another fast course. I was 27-28 at the time. And actually ran faster at 25, but likewise it wasn't certified and somewhat suspect (a good 15 sec faster than what I consider my PR).
I kept at it for another few years but never got all that close after turning 30.