To provide a method for estimating an ability of a stem cell conveniently, quickly, and accurately.SOLUTION: A method for estimating an ability of a stem cell includes the step of estimating an ability of a stem cell derived from a subject, on the basis of an age of the subject, of which the ability of the stem cell is unknown, and the results of one or more blood tests of a blood sample from the subject.SELECTED DRAWING: None【課題】簡便、迅速、かつ正確に幹細胞の能力を推定する方法を提供すること。【解決手段】幹細胞の能力が未知の被験者の年齢と、該被験者から採取した血液の1種又は2種以上の血液検査結果に基づいて、該被験者由来の幹細胞の能力を推定する工程を含む、幹細胞の能力の推定方法。【選択図】なし