I just dropped DS5 off for his first day of kindergarten. With a November birthday he should be one of the oldest kids in the class -- we have an October cutoff. Surveying the line today, I would guess he is in the middle age-wise.

When age-grouping ends up being closer to a 2 year span, these articles make me wonder why we do age-based grouping at all. It seems a much better argument for ability-based grouping.