The technique of age progression is based on the observation of the physiognomic characteristics of an individual.
Basically this technique is not applied in the case of individuals younger than 2 years of age. The reason for this limit is given by the extreme variability of the somatic traits in infants. For individuals older than 2 years it is possible to observe an excellent efficacy in its application. The basic principles see the observation of the physiognomic traits and their similarity with the closest relatives, such as father, mother, brothers and / or sisters.
On the face of a child or boy we can observe that there are traits more similar to one parent rather than the other. For example, if the child has a nose similar in shape to that of the father, it is likely that the morphology of that nose will change similarly to that of the father with increasing age. This applies to every physiognomic element.
What will ultimately be obtained is a composition of elements derived from the parents or siblings that will be modified according to the presumed age of the missing person. The usefulness of applying this technique lies in being able to update the mug shots of the missing children every 2 years and, for individuals over the age of 18, every 5 years. In this way it is possible to circulate images consistent with the age of the missing and therefore make their research more effective.