My grandma right now is 85 years old and while still very healthy, has experienced a significant decrease in mobility. Just last week she tripped on the rug and sprained her ankle, luckily it wasn't worse than it was... however she experienced a really bad fall on the concrete a few years ago and with Winter coming I'm afraid she will fall again. With no one able to monitor her, I'm really wanting to start looking into fall prevention. I know there is not technology out on the market that will entirely prevent a fall from happening, but I know there are several ways you can create whats called a "fall protection program".
PERS sounds interesting but not the answer.