Thanks for the link, georgec. I love the discussion, mainly "starwarsagent"'s posts.
Like this one :
Lightsabers contain crystals..made of different colors that can change at any given time...its like light going thru a diamond and the diamond putting out different colors of the spectrum. A red lightsaber crystal can diminish overtime in color like a glass would lose its shine or a dirty crystal.
The lightsaber crystal in Vaders saber in the PT was somewhat red in the edges. How do you know he didn't change or found a more pink crystal and put it into his lightsaber in 30 years? The color of the crystal could have faded also.
Why do I have a feeling he had never sex ?