How the Republican plan lowers premiums: It pushes out older people. https://www.nytimes.com/2017/03/14/upshot/no-magic-in-how-gop-plan-lowers-premiums-it-penalizes-older-people.html? The parts of Obamacare that Republicans would keep, change or discard: https://www.nytimes.com/interactive/2017/03/06/us/politics/republican-obamacare-replacement.html