Which of the following is NOT a sign of depression in an older adult?

Choosing C as the correct answer highlights the understanding of how depression manifests in older adults. While the other options clearly indicate signs that may correlate with depressive states, such as neglecting personal grooming, difficulty concentrating, and worrying about memory lapses, becoming lost in familiar places is not a classic sign of depression.

Instead, the behavior of getting lost, particularly in known environments, is more indicative of cognitive decline or a neurological condition, such as dementia. This distinction is crucial because while depression in older adults may lead to changes in behavior, mood, and cognitive function, spatial disorientation is largely associated with cognitive impairments rather than mood disorders. Awareness of these differences helps in accurately assessing the mental health status of older adults and tailoring appropriate interventions for their needs.