Honor your Parents so that you will live an extended life. The Torah teaches this twice in the 10 commandments.   What is the logic ? 
   By showing that we appreciate those who helped provide us with life we deserve more of it. On the path ... 
   Also , when people honor their parents it enables them to live longer , thus measure for measure the children are rewarded with longevity. 
Now may be a good time for a gem of Torah study.
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