Research findings have shown an association between bilateral prefrontal activation in older adults and performance in a number of tasks, including memory tasks. higher; long-term lower; working higher; working lower; long-term

I believe the answer is: higher; working

Working memory played a role in  immediate conscious perceptual actions. This mean that people would do working memory taks a lot more efficient as they do it over and over again. This is why older people tend to be more fluent in doing such tasks.