The right option is; c. Lose a significant amount of brain volume
When BLSA researchers studied cognition, they discovered that, over time, even healthy older adults lose a significant amount of brain volume as part of normal aging.
Cognition are various high-level brain functions which include learning, memory, reasoning, focusing, use of language, information handling, organizing, planning, and problem-solving. Cognitive abilities tend to gradually deteriorate with age and a certain level of cognitive decline is part of normal ageing.