After all, they dropped the "retired" part of their mission years ago, along with "American," "association." and "persons." I'm not quite sure when they KFC-ized themselves, but AARP no longer appears to be an acronym for anything, nor do you need to be retired, or even American, to be a member.
I'm reminded of the story behind the name of King County in Washington State. In 1852, the Oregon territorial legislature established two counties in modern-day Washington; in a blatant suck-up, they named these counties Pierce and King, after Franklin Pierce and William Rufus de Vane King, the President- and Vice President-elect.
King turned out to be a bum horse to place your bets on; he died the day after the inauguration. Thus, in 1986, when the county government decided to rename the county after Martin Luther King Jr., they didn't need to change the letterhead.