Age of the magnetically active WW Psa and TX Psa members of the β Pictoris association S. Messina, R. Santallo, T. G. Tan, P. Elliott, G. A. Feiden, A. Buccino, P. Mauas, R. Petrucci and E. Jofré A&A, 601 (2017) A54 Published online: 28 April 2017 DOI: 10.1051/0004-6361/201628514