  Stellar photometry of nearby irregular galaxies of the Local Group is used to
identify and study the young and old stellar populations of these galaxies. An
analysis of the spatial distributions of stars of different ages in face-on
galaxies shows that the young stellar populations in irregular galaxies are
concentrated toward the center, and form local inhomogeneities in star-forming
regions, while the old stellar populations--red giants--form extended
structures around the irregular galaxies. The sizes of these structures exceed
the visible sizes of the galaxies at the 25m/arcsec^2 isophote by a factor of
two to three. The surface density of the red giants decreases exponentially
from the center toward the edge, similar to the disk components in spiral
galaxies.
