Spending on healthcare is expected to quicken over the next decade, driven by people spending more of their disposable income on medical care, an aging population, and increases in the cost of care, according to an analysis by government economists.

The annual analysis released Wednesday by the nonpartisan Office of the Actuary within the Centers for Medicare and Medicaid Services projects that spending will grow by an average of 5.5 percent each year during the period up to 2026, reaching $5.7 trillion.