I often find people in their 40s' to be deeply troubled, tired, and grappling for power or ego.
Anecdotally I have encountered more people in the 50s-90s range with a calmer, wiser, and altruistic awareness of self and others. I imagine it has something to do with the thought of mortality nullifying their materialistic or egoistic pursuits, and some sort of realization that we're all here together on a big rock hurdling through space so maybe baking a batch of cookies for friends is a good idea worth spending time on.