More often than not, enrolment data for pre-primary education cover the entire age group, from 3(4) to 5(6) years, in a single rate. The problem with such aggregated reporting is that it fails to reveal differing enrolment rates from one single-year age group to the next, where considerable gaps have long been suspected. This is the conclusion of the just-published issue of the UNESCO Policy Briefs on Early Childhood.