The caption would be "Save Social Security today, who cares about tomorrow?"
Just play Joycelyn Elder's speech (while she was in Clinton's cabinet) where she says (paraphrased) "old people are just going to die anyway" and that "young people need to recieve (preferential) medical treatment because they are the ones who will be paying for my social security".
Then have the rebuttal: Now tell us again what party wants to kill off the elderly???