Reddit mentions of The Accessible Home: Designing for All Ages and Abilities

Design the house for wheelchair accessibility, and if you don't have expertise in that area, be sure to talk with someone who is dependent on a wheelchair and has lived that way a long time, because there are many little considerations that are not obvious to the rest of us.

Why? Well, of course there's the obvious case of someone in a wheelchair, or someone who's temporarily mobility impaired due to an injury. But you'd be surprised at how much more comfortable an accessible design is for non-wheelchair people as well -- things don't feel crowded, and the space just "flows". It also makes it very easy to move furniture or boxes or even just laundry baskets around. And on top of that, if this is a forever home then not having to deal with stairs/steps on a daily basis will help when you're elderly (not saying you can't have these anywhere, just that you should be able to live on the main level and accomplish all the day-to-day stuff such as cooking, laundry, sleeping, bathing without dealing with steps). And if it's not your forever home, remember that as the Baby Boomers age there's going to be a high demand for housing that has single-level living features and works well for the elderly.

If interested, start with a book like the following -- and it covers much more than wheelchair accessibility (e.g. impaired vision, etc):

The Accessible Home: Designing for All Ages and Abilities
https://smile.amazon.com/dp/1600854915/ref=cm_sw_em_r_mt_dp_U_.KEjDbZAWT3ZQ

OK, that out of the way, on to my own personal observations from the houses I've lived in...

Locate stairways at the edge of the house instead of at the core. When future you wants to remodel and has this practically immovable object cutting into the possible floorplan options, you'll say "Geez, I wish I listened to Cyrano back in the day."

Double-sink for the master bath -- definitely. I always thought these were stupid, until I got married and now the wife and I contend for the bathroom sink at bedtime every day.

A mudroom is almost mandatory (the lack of which is one of our two major disappointments with our current place). Make sure the mudroom has access to a bathroom without having to track through the house, for those times you come in from some sort of dirty work outside and need to take care of business or get washed up. Double-points if that bathroom has a shower in it as well.

Kitchen pantry. A bunch of other people said it, but I'll just give my +1 on this.

Avoid having your main kitchen sink on an island. Our friends hate theirs because the island always ends up piled with dishes and just being an ugly mess that you can't easily ignore, while simultaneously being the spot that everyone wants to gather around and visit.

I agree wholeheartedly with what others have said about isolating bedrooms from the noise of the rest of the house, and with making sure that bedrooms are designed so that you can have actual sensible bed/furniture layouts in them.

Design multiple levels so they can be thermally isolated from each other (e.g. doors at the bottom or top of stairs). It sucks big time once you realize that cold air sinks and warm air rises, so your house is never comfortable everywhere. But this problem also has a lot to do with HVAC design -- so research and plan HVAC carefully rather than letting the HVAC company just run stuff wherever looks good to them.

Plan for change. Avoid load bearing walls as much as possible, so you can modify things in the future if you want. Get a larger electrical service than you need now, in case 90% of people are using electric cars in the future and need to charge them overnight in their garage. That sort of stuff.

Consider reading Sarah Susanka's book series on "The Not So Big House", and take the principles she lays out into your design. She focuses a bit too much on Scandinavian influences for my taste, but her concept of "shelter around activity" if applied to any style of house will have a huge impact on how cozy and comfortable your home feels.