@ Buyck,

I'm familiar with exoskeleton systems, of which HAL is probably the most well-known.  I agree that exoskeletons could certainly be used to assist the elderly, but they're also being proposed as military solutions, such as the Sarcos (now Raytheon) exoskeleton shown in the video below.

In the same way that mobile manipulators are not exclusively "robot walkers", the exoskeletons are also multi-purpose. 

Thanks for your input.  I suppose it was something of an oversight to neglect them in the post.