DS1 is 3 years, 4 months and happily rides rear facing in his Orbit Toddler Seat, and in dh's car he rides rear facing in a marathon. He is small, so we have a while to remain in our seats.
DS2 is 12 months, and is about to grow out of the Orbit infant seat, but whatever we get he'll stay rear facing, of course.
Mine is the oldest, and only toddler, I know in real life who rear faces.
Big Brother 5/07
Little Brother 9/09