75-year-old Mrs. A. has difficulty with her vision due to cataracts but her friend Mrs. B., also 75, can see perfectly. However, Mrs. B.'s arthritis makes it difficult for her to walk while Mrs. A. recently ran a senior marathon. This example illustrates which principle of adult development and aging?

Question

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This example illustrates the principle of interindividual differences, as it shows how two individuals of the same age experience different strengths and challenges based on their particular life circumstances, genetics, and environment. It also implies that there is no single "normal" aging trajectory that applies to everyone, as people age differently depending on various factors. However, it does not necessarily address the other principles listed.

75-Year-Old Mrs