There have been 13 players at the age of 30 or younger who have retired this offseason, including former Baltimore Ravens offensive tackle Eugene Monroe.
Ravens quarterback Joe Flacco, who turned 31 earlier this year, has noticed the trend of young players walking away from fame and fortune. It's a growing list that features big names such as Calvin Johnson, Marshawn Lynch and Jerod Mayo.
But Flacco said he isn't worried about how the game of football will affect him later in life.