I wouldn't go by age hun. The principle here is a grandmother in her 60's & is more enthusiastic & fun than DD2's 25ish year old infants teacher. Its the personality, not the age. DD1's kindy teacher was also in her 60's & a great teacher.
I've found alot of the younger ones (around my age) can be quite stuck up at times. Not sure if they actually are or its just me, but they just don't seem as fun either. There is a male teacher at the girls school who the kids are loving in his early 20's, but the others the same age I know of they don't relate to as well.

