no one can tell u. but '美人' in china mean more than just beauty woman. People will use it for the dream or hope. So, 恐美人之遲暮 can actually mean he would like to work for his country, but it is now too late. 楚 used to be one of the strongest country as that time. But atr the time when 楚懷王 being the king. It is really weak already.