Most people are likely to retain or expand their general knowledge in the middle adulthood group is the true. Thus the statement is true.
Middle adulthood refers to the age of the person between 40 to 60 or 65 where the persons cognitive development is at the peak. The person improves his analytical and as well as develops the vocabulary and the language.
After the age of 65 a person comes under the category of Late middle adulthood.
Thus the above statement is true.
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