Having a spouse with dementia increases your chances of getting dementia too.

Being a caregiver of someone going through dementia increases your likelihood of developing the same condition by 6 times. It’s worse for men; men whose spouses developed dementia are 12 times more likely to than men whose spouses have not. A 12 year study of 1,221 senior couples found that of the 255 seniors who developed dementia, that spouses were more reliable risk factors than genes, gender or socioeconomic status. This is likely because â..." of the cases of dementia were brought on by Alzheimer’s disease. Caring for someone with dementia can be very stressful, and stress increases the risk of Alzheimer’s. Source