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Some fragrances do turn bad after a long time. Citrus type fragrances can lose their top notes, but the top notes don't hang around that long on skin anyway. I'd say give them a good sniff test and find out. You might have a couple of gems.
They may have lost a little of their original punch. I have been using a bottle that I received quite a while that was opened and put aside. It is Lynx Dimension made here in Australia. I actually like it better now and use it about once a week in my rotation of colognes. As always YMMV. I am trying to use up my colognes and aftershaves as I am getting fed up with having all these half used bottles sitting around. I need to use them up as when I am gone they will just be trashed anyway. I need to enjoy them. Use them up and enjoy them.