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A period of post-learning sleep benefits memory consolidation compared with an equal-length wake interval.However,whether this sleep-based memory consolidation changes as a function of age remains controversial.Here we report a meta-analysis that investigates the age differences in the sleep-based memory consolidation in two types of memory: declarative memory and procedural memory.The meta-analysis included 22 comparisons of the performance between young adults(N =640)and older adults(N =529)on behavioral tasks measuring sleep-based memory consolidation.Our results showed a significant overall sleep-based beneficial effect in young adults but not in older adults.However,further analyses suggested that the age differences were mainly manifested in sleep-based declarative memory consolidation but not in procedural memory consolidation.We discussed the possible underlying mechanisms for the age-related degradation in sleep-based memory consolidation.Further research is needed to determine the crucial components for sleep-related memory consolidation in older adults such as age-related changes in neurobiological and cardiovascular functions,which may play an important role in this context and have the potential to delineate the interrelationships between age-related changes in sleep and memory.