**Predictors of cognitive functioning trajectories among older Americans:
A new investigation covering 20 years of age- and non-age-related cognitive change**
Hui Zheng1,*, Kathleen Cagney2, and Yoonyoung Choi1
1 Department of Sociology, Institute for Population Research, The Ohio State University, Columbus, Ohio, United States of America
2 Department of Sociology, Institute for Social Research, University of Michigan, Ann Arbor, Michigan, United States of America
\* Corresponding author
E-mail: zheng.64@osu.edu.