TY  - RPRT
TI  - When does old age begin and a worker become old?
AU  - J TUCKMAN
AU  - I LORGE
PY  - 1953
DO  - 10.1093/geronj/8.4.483
UR  - https://pubmed.ncbi.nlm.nih.gov/13130859/
ID  - 13130859
ER  -