atila59: if that is true, how it is posible that a player has an average of 51 or 53 for example??
At all tiers, there's a saturation point. What that means is that only your lowest scores count toward average. For example, the saturation at my tier is 200 rounds. That helps people have lower averages than if all of their rounds counted.
Additionally, people can choose to play country club tournaments from the red tees. With high-end equipment, those courses can become ridiculously easy. What that means is that a person can shoot scores around 24 or 25 for 9 holes.
Take, for example. St. Andrews, front 9. From the red tees and better equipment, it becomes a drive, pitch, and putt. And, under the right conditions, over half the par 4 holes are driveable (3, 6, 7, 9), providing eagle opportunities.