My daughter is 3.25, and we will likely keep her rear facing until age 4 or so. She's small, but then again she's way over the minimum, at 30 lbs now.
Our son is 1.3 is a big guy for his age, at over 25 lbs now. We will likely keep him rear facing until at well over age 2, but possibly even over age 3.
ie. We plan on keeping them both rear facing at least until about 35 lbs or more. This is recommended for safety reasons. The 10 kg / 22 lbs (or 9 kg / 20 lbs) is absolute earliest, but most safety experts recommend much later, even up to around 45 lbs actually.
http://www.theglobeandmail.com/globe-dr ... le5958964/
BTW, what this means is you definitely need a seat protector, or else your back seat will be damaged in no time.