Hailey Green: 5 Things To Know About ‘The Voice’ Contestant Who Is Just 15 Years Old Hailey Green has made it to the Knockouts of ‘The Voice’ season 21. Here’s what you need to know about this 15-year-old standout singer. Previous Article Teyana Taylor Reveals Why She’s ‘Not Surprised’ By Hubby Iman Shumpert’s ‘DWTS’ Success Next Article Mayim Bialik Hosting ‘Jeopardy’ This Week: Current Champion & More