I too am retired and live by myself. I also look after my 88 yo Mom who lives next door with my semi-disabled sister. I find that meal preparation uses up a lot of my time.....therefore when I cook I prepare several meals at a time and refrigerate or freeze the extras for those days when I want to sew or don't have the time to cook. I may spend all one day cooking, roasts, soups, casseroles, or multiples of things like pot pies, oatmeal, boiled eggs, roasted veggies, etc. Then I have meals ready to heat and eat. The instant pot and air fryer is a great help in this area.
As a bonus of aging that spotlessly clean house doesn't matter as much as it used to. Kitchen and baths are the main areas, I focus on, the rest.....whenever the mood strikes or when company is coming LOL