Well, im 16 here, I was raised different from most of you guys, I was taught there was no Santa Clause, and that children were made via sex, it was never a mystery to me, even before i started grade school. I knew how it happened, I just didn't understand why anyone would want to do that, right? I knew the name of all the organs and their functions , but I didn't understand why, just yet. So far life is good, im not scarred emotionaly or any other way. It was just the way I was raised I guese. I will make a big notice here, though, it wasn't the goverment that taught me, it was my parents and that does make a differnce. Just my 2 cents here. Kinda to give you guys a perspective from somone who was educated at a young age.
Although they plan on teaching at age 4, I think i was 5-6 ,but in this case I don't think that much of a age difference matters.