Excerpt: By 2030, Social Security, Medicare and Medicaid may cost 15 percent of national income -- almost double their level in 2000 and equal to 75 percent of today's federal budget. Left alone, these programs would require massive tax increases, cause immense deficits or crowd out other important government programs. We also know of at least partial solutions: curb costs by slowly raising eligibility ages and cutting benefits for wealthier recipients.

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