I'd help her. I'd actually probably be more inclined to take her "under my wing" before a lot of other people so long as I did not significantly endanger my wife or child in the process (because they must be my first priority). There's a big difference in my opinion between people who could prepare and take care of themselves but choose not to, and people that can't take care of themselves due to physical and/or mental deficiencies (not counting stupidity as a mental deficiency <img src="/images/graemlins/wink.gif" alt="" />). I would see the little old lady as being the latter and would therefore help her. The fact that she is old and closer than most to a natural death is completely irrelevant to me as I would think she has as much right and desire to live as anyone else. That's my 2 pesos.
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Learn to improvise everything.