Is this really an ageing airframe thing? I dont think so. Perhaps more a case of stretching these aircraft to their very limits - and getting away with it most of the time. I think that most people would agree that these older birds get a lot more attention (maintenance wise) than a lot of the more modern equipment - a lot of TLC. We dont know what happened to any of the three warbirds that crashed this weekend....jet wash/broken control runs/whatever it is for the AAIB to sort out. Perhaps a better time to review any changes or attitudes towards where these aircraft fit in to displays would be after these reports have been finalised.
Glazed eyes dont always see that clearly.
God-bless these pilots and their loved ones, my thoughts are with you all.
Be safe