An Oldman in Counterworld.

Seitar Asao, a 73-year-old tea plantation manager, is the main character of the novel. He is mistakenly sent to another world in the place of his granddaughter by a god. Then, as Seitar, a 63-year-old man, he begins a second life. He is able to live comfortably in his new home thanks to his “assistance magic” and old man knowledge.