Not using myself, since I'm faster than average, but here are some 30s-40s dudes I follow on strava who don't run shorter distances (mostly started later).
I'd say these are guys who are dedicated and about average for people who can run 70(+) mpw. But being able to run 70 mpw is a talent in itself, so they are above average runners:
A: 18-low, 36-mid, 1:19, 2:41
B: 16-high, 34-mid, 1:15, 2:47
C: 17-mid, 1:18, 2:39
D: 4:20 1500, 16-high, 35-high, 1:20, 2:52