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This study aims to replicate key findings from our other pre-registered study, Effect of Feedback on Younger and Older Adults’ Metacognition. For more information on that study, see our preregistration at https://osf.io/9yab2. In that study, younger and older adults received feedback, presented as percentiles, on their performance on our novel cognitive battery. We then examined whether this task-specific feedback induced updates in their global metacognitive beliefs after a two-week delay. A key result from that (unpublished) study was that younger adults exhibit feedback-induced belief updating after that delay. Older adults also showed evidence of this; however, the effect was not significant either due to unexpected baseline differences or to lack of power. When we analyzed data to minimize these unexpected baseline differences, we found stronger evidence that older adults used feedback to update their beliefs, however, we did not preregister that particular analysis. This new study will collect a new sample of data from older adults, to determine if the prior results replicate or not and thereby bolster our conclusions. Information about sample size, hypotheses, and planned analyses can be found below.