We present radio maps of the head-tail radio galaxy , 3C 129 at 240 and 610 MHz using the Giant Metrewave Radio Telescope .
We have studied in detail the morphology of the source and the distribution of spectral index over the object .
We find large-scale spectral steepening along the jet away from the core .
Using synchrotron spectral ageing theory , we infer the age ( time since particle acceleration ) of electrons at various locations along the jet and ascribe an age of \sim 200 Myr to 3C 129 .
We find that the “ Crosspiece ” has a spectral index of { \sim } -1 , similar to the jet , which is not consistent with the suggestion by Lane et al .
( 2002 ) that it could be a radio relic .
We have also studied 3C 129.1 and the other sources in the field .