[1] Max Planck Inst Social Law & Social Policy, Munich Ctr Econ Aging MEA, Amalienstr 33, D-80799 Munich, Germany
[2] Tech Univ Munich, Cambridge, MA USA
[3] Natl Bur Econ Res, Cambridge, MA 02138 USA
[4] Ostbayer Tech Hsch Regensburg, Seybothstr 2, D-93053 Regensburg, Germany
[5] Maastricht Univ, Res Ctr Educ, NL-6200 MD Maastricht, Netherlands
[6] Maastricht Univ, Labour Market ROA, NL-6200 MD Maastricht, Netherlands