Researchers from the University of Michigan found that nearly half of all older adults die with a diagnosis of dementia on their medical records. Just two decades ago, that number was 36%, revealing that the number of people living with dementia may be increasing at an alarming rate.

According to Study Finds, the Alzheimer’s Association says that 10.7% of Americans over the age of 65 has Alzheimer’s, the most common form of dementia. The new report reveals that 47% of seniors die while dealing with some form of the memory-robbing disease.

The researchers examined the medical records of 3.5 million people over the age of 67 who died between 2004 and 2017. In 2004, the Medicare bills covering the last two years of their lives showed that only 35% of billing claims mentioned dementia. In 2017, that number rose to more than 47%.