Nation Texas boy is the world’s youngest mariachi. For his dad, it’s a return to Mexican family roots June 19, 2022Marc Ramirez, USA TODAYComments Off on Texas boy is the world’s youngest mariachi. For his dad, it’s a return to Mexican family roots Mateo Lopez, 7, was named world's youngest mariachi by Guinness World Records. While some see in him a future star, for his dad it's more complicated.