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The above solution seems fine inside a residence, but what if the elderly are outside? Fret not - there's help at hand as always from he technological perspective. Here's another Medical Alert device in the form of a GPS tracked bracelet. It has a very easy to use 2-way speakerphone which is very much similar to a regular cell phone and can be used to call for help. Also it has an advantage that the wearer can be found in cases of wandering due to Alzheimer's disease, short-time memory loss, etc.
So we find that Technology has as always helped us make the world better and that of our loved ones too.