Provided are a biomarker for diagnosing of the level of senescence, a composition and kit for diagnosing of the level of senescence to detect the biomarker, and a method of diagnosing the same. According to the composition and kit for the diagnosis of the level of senescence and the method of diagnosing senescence, the level of senescence of a subject is easily diagnosed, the health conditions of the subject are monitored, and a senescence-associated disease is prevented or diagnosed.