Well the title says it all really.
I don't usually get crept out by older bronies because I don't talk to them.
But once I was using G+ and this guy joined my public hangout and he looked 40 years old, and he had messy hair and just looked gross all together. So, that's only when I've actually been crept out by an older brony. I don't talk to people who are like over 20 years old anyway, I try to keep within my age group.