>>530902754
>I imagine the biggest threat to human Ciel, would be old age - she's human
That sounds like a good plot point. Ciel's still alive for whichever reason you want, still strong but...she's tired. She's really tired. Humans shouldn't live this long. I don't mean she'd be some horrible have-robotic hag thing, she'd probably still just look like an aged-up Ciel due to Mega Man science, but still.

>>530903183
Or that, I suppose.