When you're young, you're more explosive, and you can make the difference, though it's harder for you to manage games and finish them. You also need to progress on a tactical level, to improve your positioning on the pitch. As time goes by, you build up your stamina and reach a stage where you can just keep going, which is when you're much more able to manage yourself and last a full game. As you get older, you become more and more tactically aware.
So it's partly because of that development that it's not unusual to play in three or four different positions on the pitch.
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