What's that got to do with virtue ethics?
If I understand virtue ethics correctly, which I don't, virtue ethicists want to have good autopilots. They don't give themselves much credit for doing good things, except inasmuch as it shows they do them and makes them more likely to continue to do so. Likewise, they don't do slightly bad things, because that would condition them to do bad things in other circumstances.
Age Shall Not Weary Us: Deleterious Effects of Self-Regulation Depletion Are Specific to Younger Adults
Brain areas associated with self-regulation don't mature until the mid-twenties. And apparently, if you compare older and younger people in a standard set-up for detecting ego-depletion, older people are not affected. WEIRD, indeed.
In 2010, there was a study indicating that ego depletion doesn't affect people who don't expect it to (and that one was run on college students). I wonder if part of the effect might be coming from differences in attitudes about effort between older and younger people.