Agatha Christie. The mystery of the sea (№ 266192)

- Everyone tells me I look younger! That's right, ridiculous. I never try to pretend to be me for one day less than forty-three, ' she continued with feigned sincerity. But many find this hard to believe. "You're so alive, Adalind!" they say. But really, M. Poirot, if the person doesn't feel alive then what is he?
Dead, ' replied Poirot.