Bronwen is the oldest. See, if Gareth is older than Olwen, and Olwen is older than Cedric, it means Gareth is older than them all. But Bronwen is even older than Gareth.
Bronwen is older than Gareth. ( This means that: Gareth < Bronwen)
Cedric is younger than Olwen. ( This means that: Cedric < Olwen )
Gareth was born 1 year before Olwen. (This means that: Olwen < Gareth )
This means that: if we arrange these four people according to their ages from youngest to oldest based on the information provided in the above three points we have:
