Cover; Contents; ABSTRACT; I. WORKFORCE AGING; II. ESTIMATING THE EFFECT OF AGING ON PRODUCTIVITY; A. Empirical design and baseline estimates; B. Identification strategy; C. Robustness checks; III. QUANTIFYING THE PAST AND FUTURE EFFECTS OF AGING ON TFP GROWTH; IV. LIVING WITH AGING: THE ROLE OF POLICIES; A. Empirical design; B. Results; V. CONCLUSION; VI. REFERENCES