JW Convention in NJ will there be a new light?

I cannot wrap my head around the changing "truth" of the Watchtower. All the old school JW who told me this generation after 1914 would see the end beleived it with their heart and soul. Now that has changed. One of the applealing ideals about JW was it was never changing, now it changes constantly to justify itself. Are than any JW over the age of 50 who feel duped? How can you justify this is TRUTH. Truth doesn't change and the true prophet of jehovah has egg on its face? What can you say to me to tell me otherwise? The poor kid who dies at 15 is an example. The watchtower changed its organ transplant as a new light back in the 60's. when they change the blood light will anyone be upset thier kid died? with all the new light it could and probably will happen.