Translate the following sentences into English and write the translation.美国人发现，在他们以及亲友被抛入老年行列之前，很难想象年老时什么样子。衰老是人类生命周期中无人照看的非亲生儿。
AMERICANS FIND IT DIFFICULT TO THINK ABOUT OLD AGE UNTIL THEY ARE PROPELLED INTO THE MIDST OF IT BY THEIR OWN AGING AND THAT OF RELATIVES AND FRIENDS. AGING IS THE NEGLECTED STEPCHILD OF THE HUMAN LIFE CYCLE.
