@article{Hsu2012,
author = {Hsu, H.-C.  and Jones, B.L. },
title= {Multiple trajectories of successful aging of older and younger cohorts},
year = {2012},
doi = {10.1093/geront/gns005},
journal = {The Gerontologist },
volume = {52},
number = {6},
pages = {843--856},
}