Combined Gemini-South and HST photometric analysis of the globular cluster NGC 6558 - The age of the metal-poor population of the Galactic bulgeS. O. Souza, M. Libralato, D. Nardiello, L. O. Kerber, S. Ortolani, A. Pérez-Villegas, R. A. P. Oliveira, B. Barbuy, E. Bica, M. Griggio and B. DiasA&A, 690 (2024) A37DOI: https://doi.org/10.1051/0004-6361/202450795