Patrick McDermott/Getty Images Quarterback J.J. McCarthy impressed his Vikings coaches and teammates with his poise and leadership in Monday's win over the Bears. J.J. McCarthy is still just 22 years old with hardly any experience as an NFL quarterback. But he certainly didn’t look it Monday night in Chicago. McCarthy engineered a thrilling comeback in his first NFL start, impressing teammates with his poise and maturity under pressure as he accounted for three touchdowns in the fourth quarter