CCRC - How early/late is too early/late?

I don't know where to start. I'm 59 and my DH is 68. He was diagnosed with MCI (w/"concern for Alzheimer's") in December. The neurologist and neuropsychologist ordered multiple tests (blood work, CT scan, MRI, PET, EEG) which have been completed. We will meet with the neurology team at the end of March and I am pretty certain DH will receive a diagnosis of Alzheimer's at that point. All test results are pointing there.

We live in a 3 story, 4br house. I would love to stay here and keep him home for as long as possible. However, I also like the concept of CCRC. (I'm guessing we are young compared to most residents, but I have no idea. I don't know anyone who lives in such a facility.) I think DH will see a CCRC as confining. He enjoys doing yard work and having his own home, but all of that will fall on me at some point in the future. So, I view a CCRC as a good plan.

One major concern I have, regarding a move, is that I believe it will make DH's dementia progress quicker... being removed from his familiar environment. Right now, he is independent (for the most part) and very happy here in our home of 26 years.

I don't know what to do or where to start. Any advice regarding housing would be appreciated.