School moments

Why does high school have such a large affect on a person? I know that over the years I have dreamt about being back ay my co-ed boarding school so many times it gets ridiculous. When I make a new friend on facebook and see their photos I inevitably head towards the high school years and try to remember what was happening. But those 3-4 years seem so much clearer than other years that follow. Why is this so? Have I not made any friends since high school? I have moved states numerous times, had the same employervfor 23 years and was in the army reserve for 17 years. But I still eagerly await to make friends with some one I knew, but usually was not friends with, as they come into the facebook sphere of influence. When does high school become cool again?