I'm one of the younger parents in my children's classes N2L so perhaps that depends on where you live. I used to be amazed by how youthful some of the Mums were but then I realised they were the nannies lol.
I imagine that if I still lived in the suburb where DS2 was born that I would have been one of the older Mums.
Or maybe I just look younger? Either that or I am delusional