Final answer:
Delirium can affect individuals of any age, not just those over 65, and differs from dementia by having a sudden onset and being reversible with treatment.
Step-by-step explanation:
The statement that delirium only affects people over the age of 65 is false. Both dementia and delirium are conditions that can affect cognition and mental functioning, but they have different characteristics and can occur in people of various age groups. Dementia is primarily a disease of older adults, typically characterized by a gradual onset and progressive cognitive decline.
Conversely, delirium tends to have a sudden onset and can occur in patients of any age, although older individuals are at higher risk. Delirium can result from a range of causes including medication side-effects, infections, surgery, or a sudden severe illness, and is reversible with proper treatment.