Here are the main Young Sheldon character ages, based on the show’s timeline and the final season. Sheldon and Missy start at 9 and end at 14, while Georgie starts at 14 and ends at 19; Mary goes from 39 to 44, George from 45 to 50, Meemaw from 66 to 71, and Mandy from 30 to 32.

Main ages

Character| Age at start| Age in finale
---|---|---
Sheldon Cooper| 9| 14 1
Missy Cooper| 9| 14 1
Georgie Cooper| 14| 19 1
Mary Cooper| 39| 44 1
George Cooper| 45| 50 1
Connie “Meemaw” Tucker| 66| 71 1
Mandy McAllister| 30| 32 1

Quick context

The show ran over seven seasons, but only about five years passed in the story, so the characters age more slowly than the real-world release schedule. That’s why the kids stay close in age while the adults move up by just a few years across the series.

Actors vs characters

If you meant the actors rather than the characters, the cast ages are very different in real life, with examples like Iain Armitage, Raegan Revord, Montana Jordan, Zoe Perry, and Annie Potts all being older than the roles they play.

TL;DR

  • Sheldon and Missy: 9 to 14.
  • Georgie: 14 to 19.
  • Mary: 39 to 44.
  • George: 45 to 50.
  • Meemaw: 66 to 71.
  • Mandy: 30 to 32.