 But the heart, to many, may be falling out of fashion. A survey of 2,000 people conducted by Prospectus Global showed that a majority of people between the ages of 16 and 29 believe that you are officially old if you use a thumbs-up or heart emoji. Now, apparently this list of outdated or passive-aggressive emojis also includes, according to this study, it includes the okay hand, the poop emoji, the cringing face emoji, and the one with a monkey covering its eyes. All those you're not supposed to use anymore.