Which of the following statement is NOT true about delirium?

A) Hospital patients who are kept in unfamiliar surroundings that are monotonous may hear noises from machines as human voices, see the walls quiver, or hallucinate that someone is tapping them on the shoulder.
B) Among the elderly, a high mortality rate is associated with delirium.
C) Delirium has negative effects on health, functioning, and survival well after the episode itself, and can increase risk for dementia as well.
D) The younger the person the higher the risk of delirium.