What saying is most applicable to describing intellectual functioning in later life?

Question

Quizplus · Accepted Answer

"Use it or lose it" is a saying commonly used to describe the importance of continuing to use one's cognitive abilities in order to maintain them in later life.

Answer: B 
 "You can't teach an old dog new tricks" suggests that older individuals may have more difficulty learning and adapting to new information and experiences.

Both A and D are not applicable to describe intellectual functioning in later life.

What Saying Is Most Applicable to Describing Intellectual Functioning in Later