In telling and retelling stories older adults produce more instances o
f ambiguous reference than young adults. The four experiments reported
here suggest that this increase in ambiguous reference is not caused
by age- or cohort-related differences in (a) knowledge structures need
ed to determine coreference based on plausibility, (b) availability or
weighting of strategies for using anaphoric devices, or (c) assumptio
ns about the degree of specificity needed by discourse partners to est
ablish clarity of reference.