Evidence for a deficit of young and old stars in the Milky Way inner in-plane disc M. López-Corredoira, A. Cabrera-Lavers, O. E. Gerhard and F. Garzón A&A, 421 3 (2004) 953-967 Published online: 29 June 2004 DOI: 10.1051/0004-6361:20034385