12 years old: I normally play on fields that are 50/70, which means that the pitching distance is 50 feet and the bases are 70 feet. The wall will be approximately 200 feet away from home plate. 13 years old: The distance will be 54/80. This means that there is a pitcher's mound that is 54 inches high and a base path that is 80 inches wide. 14 years old: The distance between the pitcher's mound and the base line is 60/90. 15 years old: The distance between the pitcher's mound and the base line is 63/95. 16 years old: The distance between the pitcher's mound and the base line is 66/100. 17 years old: The distance between the pitcher's mound and the base line is 69/105. 18 years old: The distance between the pitcher's mound and the base line is 72/110. 19 years old: The distance between the pitcher's mound and the base line is 75/115. 20 years old: The distance between the pitcher's mound and the base line is 78/120. Baseball is a game that requires mental as well as physical strength. As young players develop these skills, they should be given opportunities to play games on fields of appropriate difficulty. The minimum age for baseball is 10 years old, but many young players start as early as 4 or 5 years old.