More about reincarnate: if you're a 200-year-old elf, you're still 200 after being reincarnated. But really the question is about the body. You get a new adult body—not young or old—appropriate for the body's race, so your inner and outer ages can be mismatched. #DnD https://t.co/nRj8JvVjdu
— Jeremy Crawford (@JeremyECrawford) November 28, 2017
Which age determines when you die of old age?
— Josh Watson 🧔🏻 (@josh_watson) November 28, 2017
If your soul and your body have different ages, bodily death is tied to your body's age, not your soul's. #DnD https://t.co/Q1XvJj3d95
— Jeremy Crawford (@JeremyECrawford) November 28, 2017
So that means reincarnate can be used repeatedly every time a creature dies of old to let them live indefinitely? That's correct.
— Jeremy Crawford (@JeremyECrawford) November 29, 2017