milbyte

i wouldn’t say that “old age” is a disease. it’s a state where actual diseases can kill you way easier, their incubation time would probably be lower than normal in that case.

but you could probably go for something like HIV which takes 1-10 years and might be fatal, especially if untreated.

not even, deathnote can control what a person does before their death. Make them give away all their assets before dying just like light made criminals give out all the information about their buddies to the police.