Calcium, a vital mineral for overall health, also plays a significant role in longevity. In the context of biomarkers for longevity, calcium levels in the body can indicate bone health and the risk of age-related diseases such as osteoporosis. Low levels of calcium can be associated with frailty and increased mortality in older adults. Conversely, excessive calcium intake may lead to adverse health effects. Monitoring and maintaining optimal calcium levels, along with other biomarkers such as vitamin D and bone density, is crucial for promoting longevity and healthy aging. Individualized approaches to calcium intake and monitoring can help support longevity and overall well-being.