Well, from the clips I've seen (here's a set of six clips), the putative time frame of the series is between the two trilogies; Leia is portrayed as a bratty preadolescent, Han and Lando are still hanging out, Greedo is still alive, Ben is living on Tattooine, etc. So Luke would be a little kid too, presumably. (And yes, that's despite all the OT references.)