I see the same thing over and over and over again. Down here we have a higher density of tennis kids so I guess I just get to see more of it. Like you said, the 12s/14s the reality sets in. We have girls down here who have websites with bios, started at age 2, dad is a coach. Others I just know have been playing since super young ages. One girl who started at age 2 had tons of early success, especially the last few years in green dots. Now she is 10.5 and in yellow balls. She is as skinny as any kid you will ever see. Nothing her training from 2-8 could do about that. She just gets physically overwhelmed by the 10-11 year olds that are solid muscle. That difference is only going to get worse as she ages. Another kid started at age 3, same deal. He is slow at age 11, despite all the early training. I am sure he has maximized his own speed, he runs as fast as his body allows him to. And he to is getting beaten up in the 12s. Another girl was a gymnast and was amazing at that as a little kid. But she grew too tall and decided to switch to tennis at age 9. Within a year she has passed almost all the other girls that age, even the ones who started tennis much sooner. But folks need to find it out for themselves to believe it. Unless their kids are just super talents who happened to start tennis early, they will get caught and passed by those talents at age 12-14, no matter when they started. Its the talent/genetics/hard work blend that will decide how far their kids go in tennis, no matter if they start at age 3 or 9.