I was given one at 16.  It was an absolutely great advantage for me because by the time I was in my early twenties (now), my credit was good enough to get a great loan for my first home.  However, it is worth mentioning I've worked since 15 and was a really responsible teen, my mom always made me give her the money for my statement and she would write the check to pay the bill so she could keep an eye on my spending.  Honestly, I think it really depends on the kid and how well they respond to limits and structure.