When do most instances of delirium, neurocognitive disorder, and amnestic disorders develop?

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Delirium and neurocognitive disorders can develop at any age, but typically occur in late adulthood when cognitive functions decline due to aging, illness, or injury. Amnestic disorders can also develop at any age, but are more common in older adults due to age-related changes in the brain. Complications at birth can lead to intellectual disability, but not necessarily delirium, neurocognitive disorder, or amnestic disorder. Brainstem injuries can lead to a variety of cognitive impairments, but not exclusively delirium, neurocognitive disorder, or amnestic disorder.

When Do Most Instances of Delirium, Neurocognitive Disorder, and Amnestic