Leonard and Sheldon might be the most unlikely to find a girlfriend or get a date, but real-life counterparts Johnny Galecki and Jim Parsons have ... doing so in 2012. They didn't tie the knot ...

See Jim Parsons and Mayim Bialik Bicker Like an Old Married Couple in Young Sheldon Series Finale (Exclusive) Jim Parsons and Mayim Bialik Return for Young Sheldon's Series Finale — First Look!