Hmm... I don't remember much from the time my mom passed until my present husband and I split up about 14 yrs ago. It was really a hard, painful time for me. My husband and kids remember a whole lot more than I remember of those days.
School was also very painful for me. I remember the bad times and don't remember any good times. However, I remember things that happened out of school during those years.
We tend to block the painful times of our lives. Maybe that's what happened to you. Just a thought.
You're not so "old"

that you would start forgetting those things. They're pretty significant in anyone's life.
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.