galahad, you also have to remember that when Yoda said that about Luke's age, he was saying it as a copout. He was looking for excuses to not train him. Remember the tone of voice he used when he said it? Very indicative of a copout. Yoda was holding on to old Jedi ideals from the days of the Council and seemingly not facing the fact that Luke was the last one and that he needed to be trained regardless.