For some reason I totally blanked on the age-range for this game.  My son is 7.  Fortunately, there are Basic and Advanced rules.  I found the Basic rules were sufficiently "difficult" and understandable.  We play with just three players, but it's easy to see how more players = more fun.  I happen to drive a manual transmission (and 6-speed to boot, just like the game) so it was a good opportunity for my son to get a grasp on the concept of changing gears.