Have finally received a second opinion, now what?

I won’t go in to my history about our first Neurologist visit....last January 2018...I finally found a neurologist I think I can trust...
Our appointment was about a month ago, the neurologist confirmed the original diagnosis that my wife had Alzheimers Dementia. He classified it as Advanced, on a scale of 1-5 she is a 3, on a scale of 1-7 she is a 4.
I had kept her diagnosis very private (immediate family).
I promised myself that upon confirmation of the first diagnosis I would tell a few close friends.
I started the process early last week...
For myself, the confirming diagnosis and proceeding to inform a few close friends... saying it out loud to a non family member really sent it home to me.
Reprocessing this all over again has made for a difficult week. Emotionally I have been all over the place.
So far it has already been difficult, but the process of watching her decline is more than I want to think about. Sometimes it just is overwhelming...oh, how I wish it were me...
She is 72....How long does she have?
Research states that the younger a person is when diagnosed the longer they live....statistically.
I am not asking a question....just saying...