Differential Item Functioning Along the Old Age Continuum: Contrasting Chronological Age with Contextual Variables in the Assessment of Gains and Losses Across Advanced Old Age

OBJECTIVES: The fourth age is considered a life stage with a high likelihood of age-related losses. However, very old age extends over decades, and little is known about how transitions that may happen during this age period (e.g., developing support needs or adopting caregiving roles) or lack thereof might change perceptions of age-related gains or losses. Many subjective age scales assume implicitly that they work across advanced old age, but data to support this assumption are scarce. …