Where did they go?

I feel really sad. After a year or so I managed to speak to a good friend of mine who somehow managed to slip out of my life and I dont even know how or when or what. Or nothing really.
And now we talked and it was nice, though a nice reminder about how its never going to be the same. My mind wanders to years ago, to all the sillinesses we did and I just want to cry for I know they're never going to happen again, its never going to be the same and I feel old.