Does intelligence change as we grow older?

       The term intelligence does not always mean the same thing. As early as the 1950's scientists distinguished between fluid and crystallized intelligence. Fluid intelligence is the ability to find ways of dealing with a new situation and to quickly grasp it simplification., even in the face of distraction or disturbance. Crystallized intelligence, on the other hand, is the end product of accumulated learning. Both forms of intelligence change in different ways over the years. As people get older, their ability to react quickly to new situations may decline, but their fund of knowledge has grown steadily larger over the years.