A series of 6 experiments investigated the use of cues and prompts by younger and older adults. Cues provide useful information about an impending target, even though the information is not always valid. Prompts provide an instruction about what aspect of the target is to be responded to. The costs and benefits of cues were most consistent with models in which the attentional resources that are shifted in response to the cue were as large or larger in older adults as they were in younger adults. The results with both cues and prompts converged on the conclusion that the time course of processing and using a cue or prompt is the same in younger and older adults. The attentional resources tapped by these procedures cannot be the diminished processing resource to which many age differences in cognitive performance are attributed.Poorer performance by older adults is common in a wide variety of tasks with a wide variety of measures of performance. The observed differences in performance may be explained parsimoniously by assuming that there are changes with age in one or a few basic mental resources, such as attention, that are fundamental to many cognitive activities.Theoretical difficulties with resource explanations for age differences on the basis of attentional resources have been pointed out (e.g., Salthouse, 1982Salthouse, , 1988aSalthouse, , 1988bSalthouse, , 1988c.Itis possible, however, to proceed without theoretical consensus on attention as a cognitive resource. Procedures can be found that can be agreed on as tapping one or another aspect of attentional processing. If age differences can be demonstrated in those procedures, then the tasks will provide operational indicators of attention, and variables that affected the age differences in performance could then be explored. If age