Lester Patrick played at over 45 years old (just a single game, he was the coach and general manager), to replace an injured Lorne Chabot.
If you discount the single isolated game the oldest goalie is Johhny Bower, with the Toronto Maple Leafs who played at over 44 years old.
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The oldest goalie ever to play in the NHL was Lester Patrick, who played a single game at over 45 years old with the New York Rangers, when their star and only goaltender Lorne Chabot was injured in his eye.
The second oldest was Johhny Bower.