The Wall Street Journal:
Nearly a quarter of the changes often seen in a person’s intelligence level over the course of a lifetime may be due to genes, a proportion never before estimated, new research shows.
The study suggests that genes may partly explain why some people’s brains age better than others, even though environmental factors likely play a greater role over a lifetime.
Understanding the factors behind healthy mental aging has become an increasingly vital one for societies with large elderly populations. However, it isn’t an easy task.
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