The 'When Guys Turn 20' meme satirizes the dramatic shift in identity many young men experience as they enter their twenties. This trend typically mocks the sudden adoption of 'mature' aesthetics, such as wearing business casual attire, developing an interest in niche spirits, or mimicking the stoic personas of characters from shows like Peaky Blinders. It gained significant traction on social media platforms like TikTok and Twitter, where users share photos of men undergoing a rapid transformation from teenage casual style to an overly polished, sometimes pretentious, adult look. It serves as a relatable way to highlight the performative nature of 'growing up' and the humorous clichés that accompany this specific age milestone.