A new study suggests that regular exercise reduces the risk of Alzheimer's disease.

Baby boomers are going to live longer than any previous generation. Alzheimer's disease, which afflicts the elderly, can take life away from people in their golden years.

Research shows that seniors stand a better chance of living fruitful years if they are physically active.

Evangeline Shuler, 99, is more active than most people half her age. She walks almost everywhere, exercises and ballroom dances.

"I dance three times a week. I walk places where I'm going and I do a few chores around the house. I live by myself," Shuler said.

A high level of activity is also helping Shuler avoid the risk of dementia and Alzheimer's disease, conditions that afflict one in ten Hoosiers over 65.

Walking as little as 15 minutes can sustain brainpower, according to a study in the Annals of Internal Medicine.

People who exercise at least three times a week are less likely to develop dementia or Alzheimer's.

"What we learned was that the modest amount of exercise would reduce a person's risk by about 40 percent," said Dr. Eric Larson.

Researchers looked at more than 1,700 people, comparing those who performed a variety of exercises including walking, aerobics and calisthenics to those who didn't.

Scientists studied them for six years, evaluating them every two years.

Shuler credits staying active with staying sharp as she approaches her 100th birthday this year.

"I think it's important that you stay where you're active, where you might have to do some dishes and change your bed and do a little dusting," Shuler said. "I think it's important that you have chores to do."