League of Legends started development in 2006 and TF2 started development in 1998 or 2005 depending on if you start counting from the redesign or not. There ar

League of Legends started development in 2006 and TF2 started development in 1998 or 2005 depending on if you start counting from the redesign or not. There are so many games that have this long a lifespan.