Once again I got a joke

So a family from Third World came on vacation to the U.S. For the first time the went to the mall. They saw many wonderfull things. Their favorite was magic metal doors that opened themselves(elevator). At one time the father and is son saw an eighty-four year old woman enter the magic doors. When the doors opened again out came a gorgeous twenty-four woman. The father looked down to his son and said, "Go get your mother."

if you dont get it the old hag went in and then they saw a young beuty come out.So in their minds they see an age changing device. The father got selfish and wanted his wife to look young and beutiful.