I wouldn't think so. My wife's been in her current home for just over 2 years and if you'd have asked me to predict who'd still be there and who'd have passed away I'd have been wrong about so many of them, it's impossible to predict in my view.
I followed a lady down the corridor hanging back as if she saw me open the door she'd try and get out, she walked well and could get aggressive, 3 hours later she died. Another man always stood in the door to his room with his walking frame in front of him like he was on sentry duty, I said goodnight to him one evening, the next day his nameplate had gone off the door and the mattress was gone off the bed, passed away in the night.
Conversely some of the 6 stone scraps of flesh, incapable of walking, talking or feeding themselves are still hanging in there, somehow.
I'm amazed how many of the residents who've been moved to the high dependency/end of life unit are still up there despite how bad they appear.
Two years ago one woman was on end of life care in the unit, she was so bad they got the priest in, one son flew home from a cruise he was on and the other son was brought, chained to a guard (and another one by the door) from prison.
She's still there now, back up and walking round, I saw her at lunch today and she's not the only one I've seen take to their bed sometimes for weeks only to reappear in the lounge, it's all very difficult to predict.
my wife has pretty much zero awareness, can't walk, talk, feed herself is incontinent and needs total care in every respect, I don't see that as final stages as other than the AZ she's perfectly health, she could carry on as she is for years given the right care her, mental impairment is pretty much total but physically that isn't any different to any other 65 year old.
K