Immerse ourselves in warm viscous fluids when we get old

My late father was unsurprisingly annoyed at his lack of mobility at an advanced age, and I commiserated with him by lamenting how impractical an orbital care home would be, but also how useful it would be from the perspective of getting around. There would be other problems with this due to stuff like osteoporosis and oedema, and in any case it would be bloody expensive, but there may be an alternative.

When we encounter considerable mobility problems, we should be suited up in spacesuit-like garments and immersed in a warm viscous fluid providing us with neutral buoyancy. This would be expensive, but still cheaper than going into space. We could glide around our fluid-filled dwellings without so many problems and the resistance provided by the fluid would prevent atrophy. When we want to eat and drink, we can stick our heads above the surface and partake of food and drink, and we can also have the whole built-in toilet thing astronauts have with nappies and stuff, only needing to be changed every now and again. I mean, this is the big flaw in my idea really. Not sure what to do about it.