Thank you, it hadn't crossed my mind that I could use the potion for sages! @kalaksed :smile: Unfortunately I read that the immortality potion works only on a currently played household and when you switch the household it stops working and the sim that is supposed to be immortal still dies of old age. It seems to be a bug and gurus are looking for save files to fix it
https://answers.ea.com/t5/Bug-Reports/NEEDS-SAVES-ROM-Sims-dying-of-old-age-despite-immortality-potion/m-p/8227835
It's a pity it doesn't seem to work, because that would have been a great solution to keep my sages around longer :disappointed: I think I'll still try it and see how it goes, so if it doesn't work I'll at least be able to share my save file.