Elder-Sim: A Psychometrically Validated Platform for Personality-Stable Elderly Digital Twins. - Jiaqing Wang; Zhongfang Yang; Xingyuan Zhu; Zong'an Huang; Hao Wang; Li Tian; Ying Cao; Xiaomin Qu; Xiang Qi; Bei Wu; Zheng Zhu (CoRR, 2026)