Neil Young has definately stood the test of time, as have Bob Dylan and Simon and Garfunkel. Another one would be Bruce Springsteen.
It's no surprise that these guys are the ones i consider to be the 4 greatest songwriters of all time, and nothing stands the test of time better than a great lyric. The fact these guys are still going strong may have something to do with the fact that, with the ezception of Simon and Garfunkel and some of Springsteens later material, they did not form part of "popular" music, which of course is where the beatles lose out. Obviously not every song will stand the test of time, as the world changes, but a good song will. The beatles, zeppelin, stones, the who, the doors and such wrote great songs for their time but obviously there are only a few standouts because they opted for different approaches to writing. Anyway, i hope i've answered for you.