My experiences is that while I did have some friends, they oftenly come and go, mainly due to changes in life (going off to university, going off to another part of the world/country/state/region/etc., change in groups, social dynamics and what not). I oftenly find myself having multiple acquaintances and then occasionally, a closer acquaintance who I hang out with and/or communicate time to time. Truth be told though, I don't even communicate that oftenly and most of the time, I'm generally pretty lonely and spend a lot of time by myself. I'd also at one point confused acquaintances with friends, which are clearly distinctly differnet. So in short, it's not unheard of to have friends at various points in one's life, but they usually come and go at different points in one's life.