After a 37-year follow-up, researchers found that 487 men had young-onset dementia (YOD) at an average age of 54. Results from the study show that the major risk factors associated with the early-onset disease included:
Alcohol intoxication
Stroke
Use of antipsychotics
Depression
Father's dementia
Drug intoxication
Low cognitive function at enlistment
Low height at enlistment
High systolic blood pressure at enlistment.