If you look at all real sports, and most people that are very successfull in there, started very young, like before they turned 10 or so. So I guess to be a professional sim racer 18 is pretty old to start. But I think most people are here for the fun of it, so it doesn't really matter, now does it?
Come on guys, lets not descend into the pointless and banal "Post your Age" thread, this is supposed to be a forum for LFS, not a pre-pubescent dating chat room! Pull yourselves together!