The lifespan of paper includes, among many factors, its acid and moisture content, and the temperature at which the paper is stored. Paper samples with pH values of six and nine were heat aged in sealed tubes at five elevated temperatures and at various moisture levels to quantify the effects mentioned. The change in the paper properties that are most sensitive to aging were measured, namely, folding endurance, degree of polymerization, and brightness. It was found that the storage lifespan of both the acid and alkaline paper will increase about sixfold when stored at 30% RH and 15°C compared with storage lifespan at 50% RH and 20°C. When storage conditions are 5% RH and 5°C, the alkaline paper lifespan increases about 500 times while that of the acid paper increases about 1,000 times compared to results at 50% RH and 20°C.