I'm afraid that AARP is not likely to want to get involved. They are an arm of an insurance company, and sad to say keeping old folks alive with expensive therapies is not in their best financial interest.
If you look at the stands they take on issues, they are not the friends of the seasoned citizens that they make themselves out to be.
According to the LifeTree timeline:
[March, 2003]
AARP's Modern Maturity magazine publishes article supporting assisted-suicide.
Link here:
http://www.aarpmagazine.org/tools/Articles/a2003-01-14-dignity/print
Timeline here:
http://home.earthlink.net/%7Ejoyinlife/
'fraid you are absolutely right. They, like many other organizations, started out on the right premise, but have, like same, fallen victim to the "power - absolute" syndrome.
This is why I dropped my membership over a decade ago..