after forty

A drama director said he have changed a lot about facing the work depression after forty years old. He have a new vision and character to deal with the problem. I guess he may as like as my age. He didn't explain too much why the transition is forty. But at that moment I think we all have an insight about life at the age of forty. Maybe it will be a shallow review when i am fifty but in this moment i think i am really different from before. I still urge to find the answer why is forty. It came quietly and brought me so huge shock.