Doodledog you described so perfectly the importance of 'shared experiences' from your youth. I moved to England in 1999 (from USA) and have made many very good friends here that I feel close to, but every once in a while, I have a real need to call my friend from childhood in Iowa, just to chat and reminisce. She is the only person (besides by children) who remembers my parents, for example. And in fact, her own mother who was a huge influence in my life and lived to be 92, but has now been gone for many years.
On another note, when I turned 70 a few years ago, I told my children that this is the age where no one seems shocked if you die. Anyone in their 60's - people will say "Oh, so young!!" But if you are even 71, they will say "Well, they had a good life." Others may disagree.