View gallery Picture Credit score: Invision/AP/Shutterstock Sheldon meets Sheldon! Jim Parsons smiled for a selfie alongside Iain Armitage, who performs the basic position of Sheldon Cooper in The Big Bang Theory spinoff sequence Younger Sheldon, on Monday, October 17. Jim, 49, in fact, performs Sheldon within the basic sitcom. Iain, 14, posted the photograph with the actor, who initially performed the