I'm trying to recall when Han was booted out of the Imperial Academy for disobeying orders and freeing Chewbacca from slavery....the graphic novel makes Him look like he'd reached his early twenties by that point and the fact he was in the Academy would also point to an age between the end of his teens and his early twenties, which means the film could be set 7-10 years before A New Hope.
Yeah, 7 to 10 years before ANH would be about right, based on the EU continuity. Han was born 29 BBY, so he would've been about 19 when he joined the Imperial Navy. The Paradise Snare
, which depicted Han's acceptance into the Carida Academy, was set approximately 10 BBY. The second book in the trilogy, The Hutt Gambit
, started 5 BBY, with Han and Chewbacca partnered as smugglers