The prevalence of<unk>  varies by age. The prevalence of<unk>  among different age groups is as follows: 6.7% for ages 60–64; 8.4% for ages 65–69, 10.1% for ages 70–74, 14.8% for ages 75–79, and 25.2% for ages 80–84. After a two-year follow-up, the cumulative incidence of dementia among individuals who are over 65 years old and were diagnosed with<unk>  was found to be 14.9%. Globally, approximately 16% of the population over the age of 70 experiences some type of<unk> .
Mild cognitive impairment
Severe cognitive impairment
Dyssomnia
Extrapyramidal symptoms
Irregular sleep–wake rhythm
Orthosomnia
Parasomnia
Hypersomnia