After settling in, he met a neighbour who was also an older man.
"Say, is this really a healthy place?"
"It sure is" the man replied. "When I first arrived here I couldn't say one word. I had hardly any hair on my head. I didn't have the strength to walk across a room and I had to be lifted out of bed".
"That's wonderful!" said Bill. "How long have you been here?"
Spoiler:

