Interestingly, the age gap serves as a catalyst for Georgie’s character development. To be the man Mandy needs and to be a father to their child, Georgie is forced to grow up faster than his peers. While Sheldon is winning Nobel Prizes and Missy is rebelling, Georgie is navigating adult relationships, impending fatherhood, and the pressure of providing for a woman who is a decade older than he is.
To understand the age dynamic, it helps to look at the specific timeline of Young Sheldon : how old is mandy on young sheldon
The writers retconned Mandy’s original age to keep her “younger” for a potential spin-off ( Georgie & Mandy’s First Marriage ). By adjusting her age down by ~1 year, the gap with Georgie feels slightly smaller. Interestingly, the age gap serves as a catalyst