IL18 and sarcopenia: As shown in Figure2A,B, six cytokines and growth factors were identified to relate to the sarcopenia traits and telomere length: CTACK (cutaneous T‐cell attracting chemokine), eotaxin, IL16 (interleukin‐16), IL18 (interleukin‐18), MIP1b (macrophage inflammatory protein 1b) and PDGFbb (platelet‐derived growth factor BB).