Modern neonatal intensive care took off in the 1960s and follow-up studies have gradually included people of increasing age. A study in Denmark using national registers (René Mathiasen and colleagues. Dev Med Child Neurol 2009;51:901–8; see also Comment; ibid: 848–50) has included all people born there between 1 January 1974 and 31 December 1976, concentrating on those born very preterm (<33 weeks gestation) …