Old age is the biggest factor when recovering and how well you can recover from any major trauma. Purely because our bodies and organs are wearing out. It doesn’t really matter how fit and well and active you seem to be before a major trauma, you just don’t bounce back as well as in your youth or even in your 40’s, it ages you. Even a little scratch on your arm takes twice as long to heal, especially if you are on blood thinners 
You being an nurse, have mainly seen the aftermath in your patients, you rarely saw what the patients were like before they came into hospital, before their illness or trauma. So you rarely saw how much their illness/trauma changed them.
The tole it takes out of you personally, is so much more too, than if you were 40 years younger.
Here is @Sonia158 latest post, her husband had his stroke in Dec 2023, didn’t do much other watch tv, wouldn’t answer phone among other issues. But life is finally on the turn around now. But like I’ve said before, he’s a lot younger, so maybe it’s just more time recovering for your husband.
Lorraine