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This is like saying we should abolish under 15s sports leagues and just mix them in with the adults.

Well... why not?

If I'm a terrible player at the moment who can I play against? If I could play against the 14-year-olds I might be able to get a game.

Why not let everyone play according to their ability, not matter what their age or 'gender' or whatever other discriminations we can think of?

The dangers in some sports when people are at different levels is great. Football, hockey even baseball can result in death.

This obviously can't work for any kind of contact sport. This can barely work for even non contact sports.