A study that was published in Frontiers in Aging Neuroscience found that adults who had busier schedules performed better in cognitive tests than those who didn't have much to do.
The participants were asked to perform a series of cognitive tests and also assess their own schedules, answering questions about how many things they had to do in a day and whether they were able to get them all done.
They found that the busier people had better working memory, episodic memory, processing speed, reasoning and crystallized knowledge.
Of course, you could look at this another way - people who have excellent cognitive functioning could be more likely to overload their schedules.
However, not all types of busyness are always positive.
When you are busy in a high stress situation then this can actually cause mental decline due to the strain of repetitive activities.
The key is to keep your schedule filled with fun new activities, such as travel or learning something new.
This can help to boost your memory and improve your cognitive functioning.