The internet's not written in pencil, it's written in ink, or something. If you've spent your entire writing life online, it's likely that some Googlebot has crawled your pages, archiving every word you've ever written. But older writers who were young hacks shouldn't have to worry: their words were printed, not posted.
Unless, of course, those older writers go on to write New York Times bestsellers and start websites that plan on saving sports journalism, at which point people go dig up things they wrote in your early years. We already had some of Bill Simmons' pop-tastic coverage of Massachusetts high school football, and now the Boston Phoenix has posted three of Simmons' earliest columns. They're long and about Boston sports, with some film references mixed in. (Naturally.)