Other non-superstar runners, that's who! I used to run 8 minutes a mile when I was in my late 20's. Now at twice that age, I'm in the 10 to 12 minute range, so you'd whiz right by me.
Keep on running and posting and that will inspire others. When a superstar gazelle runner goes down the road people think, 'I can't do that.' When they see you or me, they are more likely to think, "I wonder if I could do that."