First off, goalies are voodoo - let's establish that right away. ;-). Having said that, it's not unheard of for a goalie to only start coming into his own in his late 20s. Hasek was 28 when he became the full time starter in Buffalo, and of course Tim Thomas was 31 when he finally made the league, and 32 when he took over as Boston's starter.
Bottom line - when a goalie is hot, don't mess with it. Keep playing him. As we saw last night, when you're getting goaltending you have a chance to win every time out. That's an amazingly confident feeling as a player. Conversely, when you don't trust your goaltending, it just kills the energy on your bench...