Final answer:
The best way to slow down cognitive decline is through regular physical exercise, particularly aerobic activities, as they enhance brain function and promote growth of new brain cells.
Step-by-step explanation:
To best slow down cognitive decline, the most effective strategy is to exercise more often. Engaging in physical activity, particularly aerobic exercise, offers numerous cognitive benefits. Regular exercise has been shown to reduce the incidence of dementia by a significant percentage, and it promotes neurogenesis, which is the growth of new brain cells in the hippocampus, a critical area for memory and learning. While learning new things such as a musical instrument or reading books can also be beneficial, the option of exercising more often is supported by extensive research as a means to enhance cognitive function and delay the onset of decline.
Reducing reliance on technology for simple tasks and doing mental exercises, like doing math in your head, also contribute to maintaining mental capacity. However, when it comes to measurable impact on reducing the rate of cognitive decline, the evidence points towards the benefits of consistent physical exercise over time.