Luke has been through a hell of a lot though. (He didn't have a whole lot of time to really deal with his father issues before confronting them head on.) When the major battles were won, sneaking off to some remote world might have been what he wanted.

There's still room in the post Jedi years for him to have had a little romance and father a child before vanishing.

The island location Mark was filming on recently (with one new cast member) looks like a place an old Star Warrior might retreat to if they were seeking inner peace.

http://www.starwars7news.com/2014/08/more-interesting-bits-and-rumors-about-the-star-wars-vii-skellig-michael-shoot.html?show=comments