I have had friends throughout the years that have come and gone. Have kept track of a few, lost track of too many, have reconnected with some through the wonderful world of internet. The losses have saddened me but I guess it can't be helped. I guess if you can count two or three people true friends you maintain throughout your life, you can consider yourself fortunate indeed.
Now that I have started travelling for a living, I will meet somebody who will remind me of someone in my past and it will take me quite a while to figure out from which part of my life they may be from.