Searchin' So Long by Chicago
I started singing this song at 17. I'd gotten my first job (LOVED it) at a college (!), and thought my life is changing.
Ever since, every time I sing this song, I realize i'm in a new phase of my life. Right now? Empty nester, but moved in with Mom to care for her; meanwhile, husband became I'll, so now i'm caring for both of them. I'm deeply aware that within the next few years it will be only me.