Steve Beuerlein, Panthers (1999)

Beuerlein was already 34 years old during his best season in 1999 when he led the NFL with 4,436 passing yards along with 36 touchdowns through the air (compared to 15 interceptions). Other than that year, his career-bests came the following year when he threw for 3,730 yards and 19 touchdowns with 18 interceptions.