Utilizing comprehensive administrative from Norway I investigate birth month effects on school performance at age 16, educational achievement at age 19 and 25 and earnings at age 30. I demonstrate that the oldest children in class have a substantially higher 10th grade GPA than their younger...

The age at which students enter school is increasing. More parents are delaying their child's entry, and U.S. states are moving school entry cutoffs earlier, mainly because older students outperform younger ones on many educational outcomes. Much of the literature interprets advantages held by...