In an act of kindness, he donated all his savings to the famous charity, Oxfam International, and hitchhiked his way through America to Alaska.
I think if we want to express a hard feeling like revenge, for instance, we can say in an act of angriness he tore the documents apart.
This age-related trend can be observed in all cultures.
We can find in all cultures this age-related trends.
However, not every individual is the same.
Not everyone is the same.
