I'm 73, was nursing over 40 years. I've always tried to keep myself fit and healthy
They laughed at me at work, good-natured banter, not nasty, I looked after myself and my diet, mostly veggie, worked ft nights,4 kids,looked after grandkids. Big garden, always dogs, plus lots of other animals. The reason was because I saw folk of 40 and younger, stroke, cardiac problems, diabetes,leg ulcers, amputation, because of their lifestyle choices, and was determined not to become one. I had a very early menopause 42, told by GP I needed hrt for the osteoporosis protection. Was on it 17 years. We moved new gp wouldn't prescribe. About 20 years ago I started doing Harley Pasternak's, FIVE workout
Got myself weights,bench,E bike, bands, strength tester for hands. I live in a bungalow, but up a hill, have 2 border collies, one 9 months old. Lots of good advice on here, I only take vitamin D. Have had bone density scans,very little loss. You can get problems moving into a ground floor flat as well as a bungalow. You need to use your whole body,check feet legs,any injuries no matter how minor take longer to heal as you age. Hill walking is good for hips and knees. We have a neighbour well into his 90s who does an hour walk every single day. As for not being able to stand up if working from home,you can get adjustable desks you can stand at, just stand hourly,stretch out,walk on the spot. The occasional trip to the cinema isn't going to harm you. Just off to take the dogs on the beach!