He was too old to be trained as a Jedi? That didn't make sense. Luke had begun his training at nineteen.
"How old was he when he began his training? And how do you mean, he was too emotional? What emotion? Hate? Anger?" Those were the emotions she associated with Vader. But Obi-Wan was mentioning Vad-- Anakin's mother. If he had felt those things for his mother, who could ever have thought him a Jedi?
...he gives without any thought of reward. Leia looked down at her mug of tea hot water, and picked up the tea bag. After a moment of consideration, she tore open the odd packaging and poured the leaves into the water. Concentrating on the beverage gave her time to let the word settle into her mind. Nothing he was saying fit with the name 'Vader'. She was finding that she had to make another frame of reference to hold them, this on falling under 'Anakin'.
Was this the man Luke claimed to have spoken to in those last moments on the Death Star? Was this why he believed so fiercely that their his father had been a good man? A dear friend... like a brother. It didn't fit.