i find this to be true somewhat. since i've moved around a lot as a child, most of my friends from middle school (who i'm hanging out with now atm) want to talk about other things than our little middle school escapades and they're so much different then what i am now.
now for high scool however, these friends of mine when we hang out it's like we never had any distance separated between any of us. we just hang out and have a good time every time with no awkwardness.
i'm in college atm, and i have a few close friends and hopefully those friends won't fade away and i hope they're also these said "keeper" friends.