One thing I can not recommend enough since you are doing a new build is to consider Universal Design when making choices! Many people don’t realize that when you’re building these decisions can be integrated seamlessly and invisibly. Examples include ensuring that hallways and rooms are wide enough to accommodate a walker or wheelchair if one is needed in the future. Or choosing levers instead of round doorknobs. And if you are able to do so: ensuring that there is a full bathroom on a main floor with a no threshold shower.
My folks built a gorgeous house years ago that just so happened to also be designed with Universal Design in mind - but you’d never know it. They were in their late 50s and were planning ahead for maybe 20-30 years down the line as they were both vigorous, active, and healthy people. Well, my mother had a debilitating brain aneurysm in her early 60s and was in a wheelchair for two full years. Because of the choices they had made when building their home, she was able to go anywhere in the house, she was able to be bathed by caretakers in their no-threshold shower, and when she graduated to using a walker and learning to do everything herself again, the design principles of the entire home made it possible for her to do so.
Here are some tips of things to consider: