[kstenerud]

Your environment during your early formative years, yes. By the time you're in your mid-late teens, your moral reasoning is already pretty much solidified (and really it's more about clan loyalty than morality at that point - although we often conflate the two when it comes to inter-clan conflict).

[matt_daemon]

Maybe in an ideal world, but in practically any real world scenario this isn't the case. Spend enough time somewhere and the mechanics of that place inevitably influence the way we act, in the workforce and out.

[ipaddr]

You can change the work environment. The ability to influence goes both ways.

[robertlagrant]

Reasoning I think keeps developing with your brain to your mid-20s.

[gnz11]

The prefrontal cortex isn’t fully developed until around age 25.