  New uvby-\beta data are provided for 442 high-velocity and metal-poor stars;
90 of these stars have been observed previously by us, and 352 are new. When
combined with our previous two photometric catalogues, the data base is now
made up of 1533 high-velocity and metal-poor stars, all with uvby-\beta
photometry and complete kinematic data, such as proper motions and radial
velocities taken from the literature. Hipparcos, plus a new photometric
calibration for M_v also based on the Hipparcos parallaxes, provide distances
for nearly all of these stars; our previous photometric calibrations give
values for E(b-y) and [Fe/H]. The [Fe/H],V(rot) diagram allows us to separate
these stars into different Galactic stellar population groups, such as
old-thin-disk, thick-disk, and halo. The X histogram, where X is our
stellar-population discriminator combining V(rot) and [Fe/H], and contour plots
for the [Fe/H],V(rot) diagram both indicate two probable components to the
thick disk. These population groups and Galactic components are studied in the
(b-y)_o,M_v diagram, compared to the isochrones of Bergbusch & VandenBerg
(2001), to derive stellar ages. The two thick-disk groups have the mean
characteristics: ([Fe/H], V(rot), Age, \sigma_W') ~ (-0.7 dex, 120 km/s, 12.5
Gyr, 62.0 km/s), and ~(-0.4, 160, 10.0, 45.8). The seven most metal-poor halo
groups, -2.31 <= [Fe/H] <= -1.31, show a mean age of 13.0 +/-0.2 (mean error)
Gyr, giving a mean difference from the WMAP results for the age of the Universe
of 0.7 +/- 0.3 Gyr. These results for the ages and components of the thick disk
and for the age of the Galactic halo field stars are discussed in terms of
various models and ideas for the formation of galaxies and their stellar
populations.
