Now the anime may work differently then the manga, but
In the King Piccolo Saga, when Master Roshi knocks out Tien to make sure he survives incase Roshi fails, which he did, but my point is he said he lied about the drinking the immortality drink thing in the manga. That may explain why he still died, but would you count him as being immortal? It seems to work weirdly, because King Piccolo wished for eternal youth, so never age, and that means not die of natural causes, but when he went full power, he said he shortened his life span. Confusing! Anyway, just explaining immortality is quite vague. Not enough detail.
Piccolo and Lord Slug?
Both wished for eternal youth, so that at least gives them Master Roshi-level of immortality. Can't die of old age, but can still die if killed.
In Dragon Ball Online, Piccolo is still alive as of Age 1000, which makes him over 700 years old. Moori is younger than Piccolo, and is very old while Piccolo looks normal.23:53, February 24, 2015 (UTC)
Well, nothing like "cannot become stronger after becoming immortal" was stated ever in manga/anime. Please provide links or scans of the chapter where it is implied that because goku black may simply be not interested in immortality and it is never stated..Nekron2 (talk) 19:24, September 18, 2019 (UTC)