Cognitive decline refers to a gradual worsening of mental functions like memory, reasoning, attention, language, etc. It is a part of the normal aging process, but can also signal medical conditions like dementia.
As we grow older, changes occur in the brain leading to some cognitive decline. The brain shrinks in volume, nerve cells and connections between them are lost. Chemical messengers like dopamine and acetylcholine also reduce. These brain changes manifest as difficulty remembering recent events, taking longer to learn new things, trouble multitasking, etc.
However, age-related cognitive decline is subtle and gradual. Major disabling problems with memory, thinking and behavior are not a normal part of aging. When the decline is faster than expected or starts affecting daily life, it could indicate early dementia.
Early screening and detection of abnormal decline can help identify reversible causes like medication side effects, thyroid issues, vitamin deficiencies, and depression.