Atarting in 2016, the office projected that deficits will rise again as more aging baby boomers begin drawing from Medicare, Social Security and Medicaid’s long-term care benefits.
By 2023, the annual deficit would rise to an estimated 3.5 percent of the gross domestic product, which is just beyond the level that many economists consider sustainable in a growing economy.
By 2038, it would be 6.5 percent.
http://www.nytimes.com/2013/09/18/us/congressional-budget-office-predicts-unsustainable-debt.html?_r=0