ugghh I felt pretty good until I read "elderly"
No doubt, primal is the way to eat. I would never think of going back to CW. This is like getting back to the way I was raised before fast food - either fast food while out or fast processed foods at home. (which we mostly ate out, I hardly cooked in 15 years)
And depending on how much your body needs to heal, progress could be slower/faster, but it is healing so yes definitely do not give up on primal.
Since my goal is to maximize fat loss, I just needed to adjust my macros which also makes me feel better. But those might make someone else's conditions worse. And I felt pretty good when I started primal, but after reading threads and going even Higher HFLC, things just got whacked up. I enjoy things like fruit, and I didnt like that period of time when I was afraid to eat it. I would come to Mark's Daily Apple every day, yet I was afraid to eat one.
One of the best pieces of advice that I have read of late, was stay off the boards for the first 6 months.