What metaphors are used in Poirot Investigates by Agatha Christie?

How does it feel to be Methuselah?” (p. 102)

Here, Flora teases Major Blunt about his age. He mentions that he never talked much, even when he was young, and she replies that he must have been young a very long time ago. Then, she compares him to Methuselah in metaphor - Methuselah is a figure from the Bible reported to have lived to 969 years old – longer than any other human being.