Provided are compositions for recovering and/or ameliorating deterioration of physiological functions due to aging. A cell overexpressing GDF6 protein or an miR-17 family member. A composition for treating aging-related symptoms, said composition comprising GDF6 protein. A composition for treating aging-related symptoms, said composition comprising a human expression vector of GDF6 protein or an miR-17 family member. A composition for treating aging-related symptoms, said composition comprising a cell secreting GDF6 protein.