A character copes with a loss of their mental faculties that comes naturally with age, or one of the more severe conditions that is sometimes associated. Alternatively, a near and dear character copes with this happening to someone they care for.

Notes:
This theme is used for example when a character copes with dementia, or Alzheimer's.

Examples:
In tng3x23 "Sarek", Sarek coped with having Bendii Syndrome, which is a rare degenerative neurological disorder that sometimes affects Vulcans over the age of two hundred.

Aliases:
coping with dementia

References:
https://en.wikipedia.org/wiki/Dementia