I saw quite a few 60's this past summer for my son and his teammates who are in that age range.
My son is not what I would consider fast, average to below average at best. He usually ran around 8.0. The guys I considered fast usually ran around 7.2-7.0. These were 14 year olds who still had a lot of growing to do.
The CF on the team is the fastest kid I have ever seen in person. He was 6.6-6.5.
At the tryouts for the HS travel program my son plays for there were 150 kids there and only 8 ran sub 7.0 times.
I think a lot of dads exaggerate 60 times, just like they do pitching speeds. Reality is that for human beings in general 7.0 in the 60 is really fast. The percentage of people who can throw a ball 80 MPH let alone 90 MPH is tiny.
If you sit around youth baseball games, you would think there's a whole generation of kids who throw like Nolan Ryan, run like Rickey Henderson and hit like Hank Aaron.