As America ages, the number of people diagnosed with dementia is expected to double every year, reaching more than 1 million diagnoses a year by 2060. That translates to about 42% of those over age 55, per a study out this week in the journal Nature Medicine.

Dementia cases in the U.S. are expected to double by 2060 when around 1 million Americans are projected to develop the memory-losing condition every year, according to a new study published Monday in the medical journal Nature Medicine.

New research suggests that the risk for developing dementia is significantly higher than previously estimated, and the burden on the United States population will grow substantially over the next few decades.

The review of 261 studies, published in The British Medical Journal, also found that dementia shortened life expectancy by about two years for people diagnosed at 85 years of age, by three to four years at age 80,

Dementia cases in the U.S. are expected to double by 2060, with an estimated one million people diagnosed per year, according to a new study led by Johns Hopkins University and other institutions.

A new study found an increased risk of dementia in older Americans, with the risk among Black Americans even greater. NBC News' Anne Thompson reports on what doctors say can help lower the risk of dementia.

Dementia rates in the U.S. could double by 2060 to a million new cases per year, according to a study published on Monday. "Our study results forecast a dramatic rise in the burden from dementia in the United States over the coming decades,