Write a paraphrased version of the given text:
The fact that, for a large number of employees appointed at a young age, the step in classification corresponds to their professional experience and that the criterion of age coincides in most cases with their length of service does not alter that assessment.
That assessment is unaffected by the fact that, in the case of a considerable workforce who have taken up work in youth, the grade corresponds with the professional practice acquired and that the age criterion largely coincides with their seniority.