Things do change, and we have to adjust to that change. Paradigm shifts can be bad. Society needs quite a bit of stability, so that it can depend on its view of the world. Constant shifts in major elements of our paradigm would make our lives very difficult. Paradigm shifts often come from the young.
Older people have more to conserve.
They have more of investment, financial and psychological, in their paradigm. Winston Churchill said that any man who is not a liberal at 20 has no heart, and any man who is not a conservative at 40 has no mind. You cannot abandon a paradigm until you have one to put in its place, because our paradigm is that which allows us to function. Without a paradigm, good or bad, we cannot function. It usually takes a long time to effect a paradigm shift - often as much as 20 years, about the life of a generation.