Well, yeah, the 2007 edition of the hardback Star Wars Visual Guide basically says as much in the chapter about Luke growing up and Obi-Wan living in exile in the desert. Something along the lines of: "Obi-Wan spent 20 years watching over the young Luke from a safe distance while meditating, trading with the natives and learning about the infinite mysteries and powers of the Force from the spirit of his former Master Qui-Gon Jinn."
Well, that makes sense. Luke was aware of Ben Kenobi before the events of the film. He recognized the name Kenobi in Leia's holorecording and asked his aunt and uncle if she could've meant Old Ben Kenobi.