There are no reports on rates of amino acid racemization in bones. To investigate the possibility of estimating age by evaluating amino acid residue racemization in human bones, a heating experiment was performed and the rate of aspartic acid racemization was determined using the Arrhenius equation. Assuming an annual mean temperature of 15°C, the rate constant (k) for aspartic acid racemization in bone was calculated, and the racemization rate at 15°C k (y) was 4.1036 × 10−9-much lower than that of dentin. These results suggest that it is more difficult to accurately determine age by analyzing aspartic acid residues in bone than in dentin.