The letter, dated April 7, scolds the “wretched group of seniors” and “greedy geezers” for including the faces of young people on its fliers.

“You must feel some sense of shame for shoveling out this…,” Simpson wrote. “Read the latest news from the Social Security trustees. The Social Security system will now ‘hit the skids’ in 2033 instead of 2036. If you can’t understand all of this you need a pane of glass in your naval [sic] so you can see out during the day!”

Jodi Reid, executive director of California Alliance for Retired Americans, said the group was “completely taken aback” when it first read the letter.