  We report results from a search for massive and evolved galaxies at z>5 in
the GOODS southern field. Combining HST ACS, VLT ISAAC and Spitzer IRAC
photometric data, we develop a color selection technique to identify candidates
for being evolved galaxies at high redshifts. The color selection is primarily
based on locating the Balmer-break using the K- and 3.6micron bands. Stellar
population synthesis models are fitted to the SEDs of these galaxies to
identify the final sample. We find 11 candidates with photometric redshifts in
the range 4.9 < z < 6.5, dominated by an old stellar population, with ages
0.2-1.0 Gyr, and stellar masses in the range (0.5 - 5) 10^{11} Msun. The
majority of the stars in these galaxies were formed at z > 9. One candidate has
a spectroscopically confirmed redshift, in good agreement with our photometric
redshift. The galaxies are very compact, with half-light radii in the observed
K-band smaller than ~2 kpc. Seven of the 11 candidates are also detected at
24micron with the MIPS instrument on Spitzer. The 24micron emission could be
interpreted as PAH emission from a dusty starburst at z~2-3, however, it is
also consistent with the presence of an obscured AGN at z>5. We estimate the
completeness of the Balmer break galaxy sample to be ~40%. The comoving number
density of galaxies with a stellar mass >10^{11} Msun, at an average redshift
z=5.2, is 3.9 10^{-5} Mpc^{-3} (no-MIPS sample: 1.4 10^{-5} Mpc^{-3}). The
corresponding stellar mass density is 8 10^{6} Msun/Mpc^3 (no-MIPS sample: 6.2
10^6 Msun/Mpc^3).
