Rockford Begins (2016)?
Recast the storyline with Jimbo a veteran of Iraq/Afganistan. Rocky could be a Vietnam vet who took up trucking in the 1970s.
Jim musters out of the army in 2006-7 and is mistakenly sent to prison. He gets his pardon in 2012-13 or so and establishes his PI career.
This would open up casting Jim to guys in their mid-30s. Jake Gyllenhaal?
He looks a little Rockford-y here:
https://nypdecider.files.wordpress.com/2015/01/jake-gyllenhaal-zodiac.png?w=720&h=480&crop=1
Martin Sheen would make a good Rocky, but he's 76 and that would probably be too old -- better to get somebody in his early 60s.
Chris Cooper had real good father-son chemistry with Gyllenhaal in "October Sky," (1999), but in that movie he was much more of the stern no-nonsense disciplinarian rather than the laid-back friendly type Rocky is supposed to be.
Sheen resembles Noah Beery as Rocky a little bit more -- short, barrel-chested, etc. plus he's played a lighter-side father-figure type more than Cooper has.
http://cache3.asset-cache.net/gc/465255788-martin-sheen-attends-we-day-uk-at-wembley-gettyimages.jpg?v=1&c=IWSAsset&k=2&d=GkZZ8bf5zL1ZiijUmxa7QYdjlDK73kcvTvcnAJqLANFhS1keh%2FnRi5J43kejf52f1ND9PkBrhkD2tcgDcdIsCw%3D%3D
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4) You ever seen Superman $#$# his pants? Case closed.