A new survey by Canadian researchers has found that for women, exercising more can help prevent Alzheimer’s disease later in life, no matter what age they are. However, exercising more at a younger age had the most significant effect on preventing Alzheimer’s. A team of Canadian researchers surveyed more than 9,300 older women in the United States, recording their exercise habits at several different ages, including before the age of 18, in their 30s and 50s, and in old age. The survey found that, regardless of age, women who exercised regularly helped reduce their risk of developing Alzheimer’s disease. Regular exercise before the age of 18 tended to yield the best results, and women who exercised regularly at that age had a 30 percent lower risk of developing Alzheimer’s disease as they aged. The researchers concluded that women should be strongly encouraged to emphasize physical activity during their teenage years, rather than waiting until they are older to realize the importance of exercise.