Maybe a way to continue the show is a voice over with Jim Parson with his wife that he was wrong the age he was when his father died.

"I said fourteen? No, I was seventeen when he died. I said fourteen? I must have had too many beers at Bernadette's father's house and was confused."

This would stretch out the timeline, some might hate that but it convenient and wouldnt have to kill off George until the end of the run of the series.

This would be my idea if I was a writer on the show. Thoughts?