Before you complain that Joseph is too old now despite being 79, remember: he wasn't even a hamon master like his mom Lisa Lisa or Straizo. Even Straizo was looking old when he was 75, and we are talking about someone that trained Hamon for their entire life.
Joseph did the summer crash course...
@JKiller not possible. Kakyoin's chest was tunnelled. He says that the wounds are so serious he can't even speak anymore, so we can guess that his lungs were destroyed
And they could only restore Joseph because he only had throat damaged and 4 minutes of no blood.