Research has shown that people who take regular exercise may be up to 20% less likely to develop dementia than those who don't take regular exercise. This came from some analysis that combined the results of 58 studies into exercise and dementia.
It has been shown that going from being inactive to doing some amount of exercise has the biggest impact. Sustaining physical activity throughout midlife also seems to have the best effect on reducing dementia risk.
There is some evidence to show older people can also reduce their risk of dementia with regular exercise. One study looked at the amount of daily activity of older people. The ones who exercised the least (the bottom 10%) were more than twice as likely to develop Alzheimer’s disease as the ones who exercised the most (the top 10%).

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