Not for ever, no. But you can make the fading uniform and therefore un-noticeable. Do you know how the vinegar should be used?
Advice on washing my APC Denim with Vinegar the first time to prevent "SicK FadeZ"? - Page 2
Styleforum Top Picks
Is there a reason APC was the only option?
They will fade. Even if they fade uniformly, they will fade. There is no way to keep the fading totally uniform. Buy dark, non-raw jeans.
I've read that vinegar and salt "settle" the dye. That sounds like bullshit, my thinking being that the synthetic dyeing process involves the use of harsh chemicals. If getting denim to stay dark were as simple as a quick cold soak in a vinegar solution, then manufacturers would go that route. That said, it couldn't hurt. If you do this, air them out in full sun to get rid of the vinegar reek.
If you haven't already done so, soak your jeans in hot water, rinse in fresh water, then hang to dry. Many headzz will advise against that, but they're pretty much all looking for maximum fades, so that advice is not really relevant. Soaking will remove some of the starch and sizing, making your jeans less crispy, less prone to sharp creases, and thus less fade-prone at wear points. I've also read that leaving in the starch and sizing causes the denim to abrade itself more, causing more intense fading, but also blowout problems. I can neither confirm nor deny the truth of that, but it makes good enough sense to me not to walk around in cardboard-stiff jeans.
Beyond that, I wouldn't worry too much about excessive fading. If you're dressed in a sportscoat and dress shoes most of the time, you're not going to be putting a lot of wear into them. As for washing, If they're getting sweaty and grungy, then do it. Inside out, on gentle cycle, with a minimum of detergent. Hang to dry. Hand washing is gentler, but I find it doesn't get my jeans clean, and leaves residue, which feels disgusting in the summer.