<em>Fluid intelligence</em> is the capacity to solve a problem which an individual has not confronted before. It analyzes the ability to identify patterns or relationships within the issue and use them in order to solve the problem.
<em>Crystalized intelligence</em> is the capacity to use skills and past experience in order to solve a particular problem. It can be considered as a person's general knowledge or intellect.
Upon the early stages in a person's life, <em>fluid intelligence</em> is highly predominant, due to the fact that the individual has little to none experience.
As a person grows and advances through age groups, the percentage of use of <em>fluid intelligence</em> in comparison to <em>crystalized intelligence</em> starts balancing.
Once a person reaches maturity and enters further age groups, the predominance of his or her use of <em>crystallized intelligence</em> over <em>fluid intelligence</em> is quite clear.