We present preliminary results from our on-going survey of Galactic globular clusters relative ages .
The investigation is based on V,I images obtained at the ESO and La Palma telescopes , which make up the largest homogenous photometric catalog to date .
A second , independent sample of globulars observed in the B,V bands provides an independent check of the results based on the groundbased data .

Age-dependent morphological parameters are measured on the CMDs and are compared with two sets of independent models .
We find that the so-called “ vertical ” and “ horizontal ” methods give compatible results when the groundbased dataset is used , and that in both cases the observed trends are well reproduced by the isochrones .
The interpretation of the hst data trends are more controversial , due to both a stronger dependence on metallicity , and to the discrepancies in the theoretical loci .

Our data clearly show that ( a ) no age dispersion can be revealed for the bulk of the GGCs at the \sim 1 Gyr level ; ( b ) no age-metallicity relation is found , although the age dispersion is somwhat larger for intermediate and higher metallicity clusters ; and ( c ) there is no clear trend with the galactocentric distance , out to the present limits of our survey ( R _ { GC } < 22 Kpc ) .