1 in 5 U.S. Seniors Struggles With Memory Lapses

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Plassman said she thinks that some of the people who reverted back to normal just didn't do well on the initial tests. "But I don't think we really know the answer," she said. "We need more research to determine who will progress to dementia and who will not."

People with cognitive impairment without dementia may encounter problems with daily living, Plassman said. For example, they may not be able to communicate their health problems to their doctors or be able to follow doctor's directions.

And "they may be at risk for being taken advantage of," Plassman said.

Colin Milner, chief executive officer of the International Council on Active Aging, thinks the fast pace of modern life may contribute to memory problems among seniors.

"If you take your time, you will find that there are a lot of things you can do without losing your edge," he said. "We get so busy that some of the symptoms that are associated with memory loss are also associated with a fast-paced lifestyle," he said.

Milner thinks the key to aging well is finding balance in your life. "We don't take the time to really enjoy experiences, books or the newspaper," he said. "Slow down and take in what's around you. When you do that, you'd be surprised at how much clearer everything is."

Milner also believes that keeping your mind active can help stave off cognitive decline. For example, he recommends playing "brain games," such as crossword puzzles

"If you can find a cognitive challenge on a regular basis that is fun and you enjoy doing, you can keep your mind sharp," Milner said. "Your brain is like your body -- use it or lose it."

More information

For more about memory, visit the U.S. National Library of Medicine.