Final answer:
Memory, problem-solving, and information processing indeed affect the ability to introspect in later adulthood, and engagement in physically and mentally stimulating activities can delay cognitive decline.
Step-by-step explanation:
The statement that memory, problem-solving abilities, and information processing influence an adult's capacity to introspect in later adulthood is true. Cognitive development continues throughout adulthood, and though our crystallized intelligence may hold steady or even improve, our fluid intelligence which includes abilities like information processing and memory does start to decline in late adulthood.
Engagement in mentally and physically stimulating activities has been linked to less cognitive decline and a reduced incidence of mild cognitive impairment and dementia. Nevertheless, older adults are still capable of complex thinking and can employ past experiences to help solve new problems.