HOW YOUNG CAN AN INTERNATIONAL FOOTBALL PLAYER BE?

How immature can an general football player be? (football as in soccer)
Like, have been there any age extent for a child prior to he is means to fool around for a country?

Just wondering.
I know for clubs they take juniors as immature as thirteen as well as sight them prior to they stick on a initial patrol during around 16-ish though what about a general teams?

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