Robert Pattinson turns the big 2-4 today, and we're celebrating by taking a look back at his first two decades! There are plenty of reasons to love Rob, including his long list of big screen roles — how well do you know your Rob trivia? The last couple of years have been crazy ones for him with all traveling on behalf of Twilight and Eclipse, as well as filming Remember Me and Bel Ami. Now, we've gathered hundreds of pictures to test your Rob knowledge. Can you tell the difference between photos of Rob at age 22 vs. 23? Click here or below to start guessing!