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International Debutant
so the next question is, why would you pick an experienced player when he is struggling, hoping that he will be good in a year and sometimes when that player doesn't even have 3 years of cricket left in him?That should be the idea for any selection for any player, any time.
If you do not believe a player will make an impact in the game you are proposing to pick him for, you have made an error in picking him. If you pick a player and he does not perform over a short "trial" period, then you should leave him out (presuming there's someone else with a case to play instead). If you pick a player and he performs, you keep picking him for as long as he continues to perform.
16-year-olds don't often make any impact in international cricket and Tendulkar was no different. He was 17 before he made any impact - and even then this is for one of the most exceptional players ever.
Hardly any "normal" player will have any chance whatsoever of success in international cricket before the age of 20 or so. Many it'd be even older - 22 or 23.
But you should never, ever pick someone for a match now in the belief that he'll be good enough to play in a year, or 3 years', time. Any such selection is a poor one.