Gallup has some recent polling on PPACA/Obamacare approval by age bucket. Below is their graph with my comments:
If the young adults like Obamacare and follow-up that liking with enrollment, the actuaries are very happy. And if the old folks who don’t like Obamacare but have not gotten to Medicare yet don’t sign up en masse, the actuaries are happy. And if the middle aged folks, even the ones who don’t want to admit that they are closer to middle aged rather than young, are blase about Obamacare and sign up at population proportionate rates, the actuaries are neither happy nor sad.