The average career span for a Major League Baseball player is 5.6 years. For a player in the National Football League it is only 3.5 years and for an NBA player, the average career is just short of 5 years.
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The average life span varies because it is very easy to get injured, so maybe 10-15 years.
The average lifespan of a baseball player in the major leagues is the same average lifespan of the average North American civilian. 75 years +/- 5 years.