Rather than actually use an aging filter on the app, 15-year-old Armitage — who has portrayed Sheldon Lee Cooper on Young Sheldon for seven seasons — is replaced on-camera by predecessor Jim Parsons, who portrayed the adult version of the character on The Big Bang Theory.

Thanks to the power of technology, Young Sheldon and Old Sheldon can coexist. In anticipation of the hit sitcom coming to an end — with a finale featuring a cameo appearance from a certain someone — Iain Armitage teamed up with fellow Sheldon Cooper actor,

Young Sheldon meets the original Sheldon Cooper! Iain Armitage has starred in the title role of Young Sheldon since the series debuted in 2017. The show is a prequel to The Big Bang Theory in which Jim Parsons starred as Sheldon Cooper in his adult years.