Well. I have been an eye on my older esteemed elder elderlie's since I posted this topic!
Plus to keep them healthy I have been giving the whole tribe a medium health tonic daily.

Just now, I gave my 74 year old elder elder a tonic, he was not my oldest, his health bar was at full before he drank it, and after it said he felt better then immediately it said he felt sick. I moved him to the hospital where they cured him, and he then walked to the amphitheatre and lay down and whoosh the bones appeared.

I have tried taking villagers to the Roster but they look at and then go back to what they were doing.