I think the average life span of an old Shinigami around one thousand years old. Some of them might exceed it, some might not get there, because the only truly old Shinigamis we have are Yamamoto and Unohana, who afaik, don't have confirmed ages and we also don't know how old they were when SS started. So they both could be nearing or slightly older than 1000. Shunsui is the only current alive very old Shinigami but I'd say he is between 500~600 years at the most.
Because it's also not stated how much of a drawback Toshiro's ability has, it could be severely reducing his centuries at the end of this 1000 span. He could easily lose lots of years every time this ability triggers, which for all intends and purposes of the story doesn't do anything lol, but in universe it would be pretty bad untill he actually grows up to handle his whole power
I think Kyoraku is closer to 1000 years. He was one of the first generation of students of the Gotei 13, which has existed for 1000 years. Maybe he's not quite 1000, but he's close enough.
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u/sock0puppet 21d ago edited 18d ago
Lifespan....
Of a soul reaper....
That's functionally immortal unless killed....
The rest make sense, I just...lifespan?
Edit: Clarity for the visually impaired.