For aging in place, try to keep the primary work zones & appliances on the same wall and, as Darbuka mentioned, use the "Ice.Water.Stone.Fire" mantra to guide you:
Ice -- Refrigerator
Water -- sink, prep or cleanup
Stone -- workspace
Fire -- cooktop or range
So, arrange the following on the same side:
Refrigerator + 42" of counterspace + sink + DW + 24" counter & storage (if possible)
As you age, you will find not just carrying, but also lifting heavy objects such as a pot full of water more difficult. So if you can arrange your Kitchen such that you can slide pots/pans along the counter rather than lifting to carry to the other side or even to a cart, you will be better off.
I'm planning my retirement home and my Kitchen will do just that. While my refrigerator will not be along the same run, it will be across the end of the peninsula with at least 48" (hoping for 51" to 54") so I can take things out, place them on the peninsula, and move to the prep sink just to the left of the peninsula without having to lift things again. So, I'll be able to slide to the prep sink (with plenty of work area on both sides), then to the range/cooktop, and, finally, to the Cleanup Zone. The Cleanup Zone will be on the other side of the range/cooktop so that I can slide things over to that, if necessary. Basically, I will have a "U" with the refrigerator, extra wall oven, and "Gluten Zone" across from the base of the "U".
I will not have an island b/c they become obstacles if someday one of us ends up needing a walker or wheelchair. The peninsula and legs of the "U" will help protect the primary work zones from traffic without being an obstacle.
Q
600 sf cabin
Q