I can't speak for everyone, but for me, my wounds reopen occasionally. To be more accurate, time gives you more distractions to get your mind off of past trauma. The trauma is still there, you might even forget it at some point, but typically for me, it just gets buried underneath all the new experiences and stimulations in everyday life. 

But I try to learn from bad/traumatic events to think of what I could do differently to improve myself.