To provide pharmaceutical compositions for the diagnosis, prevention, and / or treatment of age-related
cognitive decline, including
pathological neurodegeneration. [Solution] A pharmaceutical composition comprising the following components: a therapeutically effective amount of one or more of the following: a CD103 inhibitor, a
perforin 1 inhibitor, and an IFNγ inhibitor, wherein the CD103 inhibitor is an anti-CD103
antibody, selected from the group consisting of PE anti-human CD103
antibody derived from clone Ber-ACT8, mouse anti-human CD103
monoclonal antibody (mAb) derived from clone 2G5.1,
humanized antibody of 2G5.1, OX-62,
humanized antibody of OX-62, anti-mouse CD103 mAb derived from clone 2E7,
humanized antibody of 2E7, and paxilin; the
perforin 1 inhibitor is selected from the group consisting of diarylthiophene and GSK2126458; and the IFNγ inhibitor is selected from the group consisting of mesopram and locagramide.