The question, "Is it appropriate for a 2-year-old to suck his thumb, but inappropriate for a 42-year-old to engage in the same behavior?" underlies the issue of

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The question is highlighting the concept of age norms, which refer to societal expectations and standards regarding appropriate behavior at certain ages. It is considered normative for young children to engage in behaviors such as thumb-sucking, but this behavior is not considered appropriate or socially acceptable for adults.

The Question, "Is It Appropriate for a 2-Year-Old to Suck