http://www.premierleague.com/en-gb/matchday/barclays-u21-premier-league-tables.html?paramYouthStage=NATIONAL
I don't know how up-to-date this is, but in my experience it's at most a day off.
I take these tables with a pinch of salt though. Most of the top clubs have a raft of U21-eligible players on loan, and so the U21s include more U18s, while the U18s have many U16s included. Also, while I want us to win every game, I'm more concerned about how the players are developing. Rehabbing senior players can distort the table too.