I am glad i retired too. Got fed up with dealing with idiots.
Oh and by the way this nonsense has been around since well before 2005 which is when i retired.
To be clear what i was replying to were the people who said they wouldn't buy a bungalow because they didn't want/were worried about/getting "bungalow legs" so.....let me explain why its not a risk...and also why there is zero research let alone valid research.
Point one. Life and everyday life exercise and activity is multifactorial. its not like going to the gym and using a stair stepper. Simply owning a house with stairs and using them in the course of everyday life is not going to significantly contribute to mobility and general body strength, joint health, muscle mass and so on. This is also why there is little or no research and even less valid research. I did find one piece by japanese researchers and their results were inconclusive.
Point two (and carrying on from point one) lets say Matt Weston buys a bungalow. Its the only life change he makes. Is he going to lose ROM, strength or muscle mass? Of course not. Why not? because he continues his existing level of activity. Same with the general averagely active population.
Point three At this point, I will stipulate that stepping up and down doing multiple reps, can be a valuable part of rehabilitation in conditions where the person's physical condition is reversible. So yeah some people might choose to keep a staircase around in case they ever need to use it for exercise (insert eyeroll here) BUT they'll need other options for eg sleeping and hygiene because such exercise will probably need to be timed to get the benefit, eg after pain relief, during the day rather than first or last thing and so on. probably better to fork out for a step exerciser if you ever need one.
Point four Obvious one really. people who are struggling with stairs for non reversible reasons will be better advised to to choose a more sustainable method of exercise, one that can be done at optimum times, is less risky and will encourage better motivation and compliance.
TLDR: If you want a bungalow get one, categorically your legs will not drop off for lack of stairs....not even in old age......and don't believe all you read or are told....