I wonder about that. How extensive do you think his immortality is? Do you think he keeps it if he doesn’t keep up his rituals? For all we know he might have actually died by now, it’s been almost twenty years. It would’ve been a good arc for shikamaru though to go and dig him up and delve more into the mysteries of jashinism. If anyone was smart enough to figure out his secrets through investigations, it would be shikamaru