I must say, I don’t like him that much. Cowboy? Really? More like Space-Boy or something like that if you ask me. Cowboy sounds so western and so, so, what is the word I’m looking for? 19 and 20th century. Not “In the future” typ.
The creators of the show hasn’t said, but I don’t think so. The show takes place before we first met Luke in Episode IV, during the “spark” of the rebellion. So, it would be weird to meet Luke while he was still a boy living on Tatooine.