Social media usually follows the generic perception of popularity: it places young faces in the midst of glamour, and rewards them with lucrative product deals. In the era of content creators and influencer-driven economy, young adults (teenagers even) are landing collaborations that put traditional jobs and paychecks to shame.That’s what makes 75-year-old Zhu Yunchang from eastern China so remarkable.Forget chasing likes for his own ego and seeking internet validation at such a ripe age; Zhu sits down at night, sometimes tired from watching over his nine-year-old grandson all day, to do makeup tutorials that have captured millions of hearts.Zhu Yunchang’s…