see you auntie said:Obi Wan in the prequels has a mole on his forehead where Alec Guinness' Kenobi does not. Zomg Conspiracy. The original Kenobi must has died on Tatooine post episode 3 and some older dude (that would explain the age discrepancy) must have taken his identity. Maybe some evil jedi who planned o lure Luke to the dark side through lying to him about his father!
Hey! That's my conspiracy! I came up with it first!
And actually, I am going to have to agree with TheBoost, the more I look at it and think about it, the more amazed I am at their impressive casting job.