The 10 Year Challenge, also known as the Glow Up Challenge or the Aged Challenge, is a viral social media trend where users post two side-by-side images taken ten years apart. Exploding in popularity across Instagram, Facebook, and Twitter in early 2019, the trend was initially a way for people to show off their personal growth and physical changes over a decade. It quickly expanded beyond selfies to include humorous takes on aging, environmental changes, and the evolution of technology or pop culture figures. While some viewed it as a nostalgic way to reflect on the past, others used the format for satire, comparing how things have changed (or stayed exactly the same) in an increasingly fast-paced digital world.