What defines an adult? I do think most superhero and vigilante types are perfectionists, busybodies, idealists, sublimators, etc. These things don't go side by side with your average adult life. However, your average adult life is not terribly interesting programming.
Salaryman Kintaro's a good example of this. Office workers don't normally live exciting lives. But when the hero's a former Yanki (biker gang) leader trying to prove to his toddler son that pencil-pushing is just as badass... Well, you throw in Yakuza, business cabals, and tons of potential love interests... It's incredibly cheesy and Mary Sue-ish but the ending carries some weight to it because it does shows consequences to Kintaro's renegade salaryman style.