Board Thread:Questions and Answers/@comment-46342776-20200714103420/@comment-29325824-20200714103950

1) Depends, seemingly on their power. Yamamoto, for example was over 2,000 years old when he was killed, while Rukia was still "only" 150 by the start of the story. They can die of natural causes, but it certainly takes a long time.

2) No, after a Soul goes to Soul Society, they arrive at the age they died at.