anybody running long distances?

I would like to know something more about running long distance. I need some general information. How old you should be? Something about running technique. I am a kind of men who doesn't like to rush in things. I want to collect all the necessary information. So is there anyone who was running long distance?

I was running and I am still running. Long distances, of course. There is no rule when you can start with it. But the best performance you can show for 5 km race is at 27 years for male, 10 km - 29 years and marathon between 31 and 37 years. You have to strike the ground bellow the center of gravity with both foots. Strength exercises for abdominal muscles and lower back are required. Stretching is very important too.