A very commonly used design in adult development and aging research is the extreme age design ("young" v."old").Which of the following is a limitation of this type of study?

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All of these options are limitations of the extreme age design. The samples are not representative and may not generalize, the measures may not mean the same thing across age groups and may not be valid, and age is not treated as a continuous variable.

A Very Commonly Used Design in Adult Development and Aging