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Multifrequency observations with the GMRT and the VLA are used to determinethe spectral breaks in consecutive strips along the lobes of a sample ofselected giant radio sources (GRSs) in order to estimate their spectral ages.The maximum spectral ages estimated for the detected radio emission in thelobes of our sample of ten sources has a median value of $\sim$20 Myr. Thespectral ages of these GRSs are significantly older than smaller sources. Inall but one source (J1313+6937) the spectral age gradually increases withdistance from the hotspot regions, confirming that acceleration of theparticles mainly occurs in the hotspots. Most of the GRSs do not exhibit zerospectral ages in the hotspots. This is likely to be largely due tocontamination by more extended emission due to relatively modest resolutions.The injection spectral indices range from $\sim$0.55 to 0.88 with a medianvalue of $\sim$0.6. We show that the injection spectral index appears to becorrelated with luminosity and/or redshift as well as with linear size.

Spectral Ages of Giant Radio Sources