My Dad lives in the home we grew up in. He is 92 with stage 4 kidney disease. So far he is mentally sharp and takes his own medicines 4 times a day as well as preparing his own meals except for dinner, which my sisters and I prepare for his freezer so he can microwave.
We clean his house a minimum of once a week.
I set up his pills on a monthly basis and have a daily check list for him for when he takes them. It works amazingly well.
He refuses anyone to help him bathe...very modest. But is getting less and less frequent as it wears him out.
The concern at his age, and using a walker, would be if he fell at home, or more importantly, if he fell and injured himself. If that happened, that certainly would cause me to look for a new home for him.