  We present a new technique for the determination of age and metallicity in
composite stellar populations using Stromgren filters. Using principal
component (PC) analysis on multi-color models, we isolate the range of values
necessary to uniquely determine age and metallicity effects. The technique
presented herein can only be applied to old (tau > 3 Gyrs) stellar systems
composed of simple stellar populations, such as globular clusters and
elliptical galaxies. Calibration using new photometry of 40 globular clusters
with spectroscopic [Fe/H] values and main sequence fitted ages links the PC
values to the Str\"omgren colors for an accuracy of 0.2 dex in metallicity and
0.5 Gyrs in age.
