front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |13 |14 |15 |16 |17 |18 |19 |20 |21 |22 |23 |24 |25 |26 |27 |review

Workers with high age will be highly influenced by selective processes. becauser, the proportion of persons attaining the required level is likely to be smaller in the old age group.