Agatha Christie's statement is a clever play on words that highlights the unique qualities of an archaeologist as a partner. The comparison between the aging process of a woman and an archaeologist's increasing interest in her is witty and charming. It suggests that an archaeologist values depth and history, qualities that become more pronounced and appreciated as a woman grows older. The statement also implies that an archaeologist is someone who values and appreciates the passage of time, making them an ideal partner for someone who is aging. It speaks to the idea that true love and attraction deepen with time, much like the uncovering of ancient artifacts and history. The statement also suggests that an archaeologist is someone who is patient, curious, and willing to invest time and effort into understanding and appreciating their partner. Overall, the statement is a lighthearted and romantic way of highlighting the qualities that make an archaeologist an ideal husband. It celebrates the idea that love and interest can grow stronger with age and experience.