Munster soon showed their class, though, and after intense pressure on the Saracens line they eventually got their reward with their first try of the game.
In practice, this means some start soonafter their fourth birthday and could be in a class with children almost a year older than them - the September-born children.
According to an academic paper published recently, people born soonafter the second world war were much more likely to move out of their parents' class than those born in later decades.
That typically happens as soon as a case is filed, and then again after the court certifies it as a class action and the defense requires the plaintiffs to supply facts supporting their case.
Aventis, the only big drug firm claiming to have a new class of antibiotic that's likely to win approval soon, is still held up after a two-year regulatory delay.