I run marathons in the 2:35-2:45 range as a 40 year old male. I'm not that good myself, maybe decent. I think of myself as slightly above average even though "average" is probably 4:00 for males and 4:30 for females. But those are embarrassingly slow times. If someone tells me that I'm like sure.
But what times should I be impressed with? or feign it? (yeah I'm just a jackass who only thinks times faster than mine are impressive). If someone says they ran a 2:5x I'm thinking that's decent though I'd hate that myself. When they say 3:0X my ears close off and at 3:3x I'm like so you even trying bro (or gal). I think most ppl I know who train seriously/semi seriously run from 2:18 - 2:5x so my perspective is a bit warped.
My family always thinks my times are like record breaking but to me they're just good but okay.