Sorry , only just seen this ….
We had my parents living with us for 10 years ( then after 5 years ….my mum had to go into Care for dementia , so I had my dad for here for five years without her , we’d visit her every day …he died here at home from kidney and heart failure …which he wanted to do , in his own bed…)
Dad died at 90 , mum lived on in Care until she was 99.
I can tell you that they were lovely years , no regrets , so glad we had that time together.
Many blessings on you both. You will be very tired as he ages , and sometimes you’ll feel like it’s too much…but you will have this time together as a treasured memory …
Hugs and prayers ….H