Here's a good article for understanding the language in which the GOP budget proposal is being presented.

Update: Here's a nice addendum from Kevin Drum delving further into the claim that "seniors would get 'the same kind of health-care program that members of Congress enjoy.'" Short story: they wouldn't. Or they would, but it would cost them a lot of money, $3,300 per year more right now, and more than that with projected health care costs in the future.