What is success?
Have you ever seen a successful person? Does such an individual exist? Achievements give way to desires; we rarely ever feel accomplished. We're always growing too, forever learning, there's usually something we discover about ourselves through self-awareness that we'd like to alter.
Ultimately, it seems that success has less to do with attaining things which represent a measure of status, as it's not something to capture; rather - success is a willingness to embrace change. So, you know, a middle-aged unemployed person isn't unsuccessful if they're engaged with the moment and dancing with change. This understanding aids one's self-worth, as your worth isn't systematically defined. That eases depression too, as your current state isn't permanent; you can transform if you're willing.