Nearly half of Americans are at risk of developing dementia after the age of 55, but a new study suggests three lifestyle changes could delay that diagnosis by more than a decade.

Researchers tracked more than 12,000 participants more than 25 years in a study published in Neurology. They found that people who entered old age with normal blood pressure, no diabetes and no history of smoking lived 13 years longer without dementia than those who had all three of those risk factors.

This is not the first time scientists have linked lifestyle choices to dementia. Previous studies have found that eating a balanced diet, staying physically active and challenging the brain with new skills can also help reduce the risk.

Genetics can also play a role, which is something outside of a person's control. Doctors say it is normal to have memory changes with age, but with dementia, those forgetful moments can really disrupt daily life.

While there is no cure, there are treatments that can slow the progression of the disease.