There are very few 19-22 year old goal tenders (or players for that matter). For the most part players hit a sort of peak at the age of 24 (players still get better each year until 30, but at a much slower rate). Most young goalies cannot compete with the back-ups that are currently in the league so they are relegated to the AHL until they are older. Here are a few of the young goalies I found. Pay attention to the development as opposed to comparing statistics (In
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One important part of developing a NHL player is experience. Halak and Price are at near equal performance levels (despite the age gap) and it would be wise to invest the player you have for another 4 years rather than the one you'll lose in two (or sooner). Giving games to Price is a wise choice because he is and will be your number one for a while. Halak does not want to be a number two and will move on as soon as he can. Why Montreal is holding onto two young goalies doesn't make sense to me. They really should choose one trade the other and get an experienced goalie to help Carey out.
That said, there's no question in my mind that Price will have a better career (assuming no injury issues) compared to Halak and that doesn't matter if you choose to measure performance based on game played, save percentage or wins etc. Sure, there are growing pains, but overall Carey Price is a great goalie, just Halak's done a little better so far.