Including all player positions, the average NFL career is four seasons.
The professional life of an NFL quarterback is short. The average length of an NFL quarterback's career is only 4.4 years.
8 to 11 years
"There is a little bit of a misrepresentation or a misunderstanding on that. Frequently, it is said that the average career is about 3.5 years. In fact, if a player makes an opening day roster, his career is very close to six years…If you are a first-round draft choice, the average career is close to nine years. That 3.5-year average is really a misrepresentation. What it adds is a lot of players who don't make an NFL roster and it brings down the average."
100m
The average career length is pretty long. This is because there are not as many injuries suffered in the sport as with football and basketball.
3.52 years
1000 years
The average career length of a Rockette is around 5-10 years. This can vary depending on individual circumstances such as injuries, personal decisions, or other career opportunities.
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16 years
Counting only quarterbacks who have played more than one full year (you'd be amazed at how many short-lived QBs there are), the average career length of an NFL quarterback is 6.6 years. Source: http://www.pro-football-reference.com/players/qbindex.htm
9-10 years