On October 10th 2009, at the beginning of last season, Brett Favre turned 40 years old.
He went on to have arguably his best season ever.
So where does he fit in among all-time 40-year-old quarterbacks?
There have been 17 different NFL quarterbacks to see playing time after their 40th birthday.
Let's countdown the top five 40-year-old quarterbacks of all time.