Passage Summary: Old people who have lived in the same town their whole lives are much sicker than the old people who just moved there in the last few years.

Reasoning: Data indicates that elderly lifelong residents of a community have significantly worse health outcomes than elderly people who moved there recently.

Analysis: We are looking for a discrepancy: why are the 'newcomers' healthier than the 'locals'? To resolve this paradox, we need a factor that applies to one group but not the other, such as the 'healthy migrant' effect where only the healthiest seniors are capable of moving. Since this is an 'EXCEPT' question, the correct answer will be the one that fails to explain the gap—perhaps by describing a condition that affects both groups equally. Focus on finding which four choices provide a reason for the health difference and which one is irrelevant.