Walk into most early years classrooms and you will see children grouped neatly by age — four-year-olds in one room, five-year-olds in another. It is tidy, predictable and deeply rooted in how we have ...

This summer, my kids spent time hanging out with their cousins who were visiting from out of town. My kids range in age from 11 to 19 years old. Their cousins are between 6 and 9 years old, but age ...