Jii-sama ga Iku [An Oldman in Counterworld.]
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Due to a god's mistake, 73-year-old Seitarou Asao, who runs a tea plantation gets transported to another world in the place of his grandchild. He then starts a second life 10 years younger as 63-year-old Seitarou. Through is wisdom of an old man and "assistance magic," he is able to live a leisurely life in his new home.
I love that it’s a story about a 73 year old happy to be reborn as a young 63. Plus I’m a big tea enthusiast so him being a tea plantation owner is a plus.