The purpose of this study is to examine age-related decline in tempo control ability using singing-based methods. Maintaining a stable tempo is a fundamental skill in musical activities such as singing and playing instruments. However, in practical contexts—particularly in music education and therapy—older adults are often observed to struggle with adapting to the tempo of other participants or to that of the accompaniment. While previous studies have empirically demonstrated that tempo ability declines with age, most of these studies have employed highly controlled experimental tasks, such as tapping, and have rarely explored tempo control in naturalistic contexts like singing. Moreover, few studies have specifically investigated singing tasks involving older adults.　In this study, we compared older and younger adults to examine differences in their ability to perform at various tempi while singing or playing instruments. First, participants completed a Spontaneous Production Rate (SPR) task to measure the tempo at which they could comfortably sing or play. Next, they were asked to sing well-known Japanese songs at tempi either faster or slower than their spontaneous tempo (Synchronization-continuation task). Tempo accuracy was assessed by analyzing whether participants could maintain the target tempo provided by the accompaniment, and whether their timing aligned with the onset of accompaniment notes. Finally, we compared the performance of older and younger adults across different tempo conditions to determine how deviations from their spontaneous tempo affected their accuracy.　A preliminary experiment was conducted with two older and two younger adults. The results indicated that as the accompaniment tempo deviated further from their spontaneous tempo—either slower or faster—the tempo accuracy of older adults declined more markedly compared to that of younger adults. Findings from a larger sample will be presented at the conference.　Previous research has shown that musical engagement contributes to the quality of life in older adults. However, difficulties in maintaining a stable tempo may reduce their motivation to participate in such activities. By clarifying the characteristics of tempo control in older adults using singing—a familiar and accessible musical activity—this study may inform the development of music education and therapy programs tailored to the needs of aging populations.