Rask, Neimi and Halak do not have enough games to be up for the Vezina - which puts Jimmy firmly at #3 in both SV% and GAA.
First, I agree with you that age will be used by the voters against Howard. But I disagree that it is "unfair".
MLB has seen a 28-year-old Rookie of the Year who was an established professional in Japan for many years and arguably in the "prime" of his career by the time he came over. http://www.seattlepi...16_mari12.shtml
That said, I do not think Howard will win the Calder. He should be "considered", but I don't know if he will even be thought of as Top 3. As impressive as he has been, he's 5th in save percentage and 5th in GAA, and the guy that leads both categories is a 23-year old rookie, Tukka Rask. And that's not even comparing him to non-goaltenders, such as Myers, Tavares, and Duchene. I do not believe that Howard has any realistic shot at Top 3 or even Top 5 in the Vezina, either. Rask has the numbers for it, but his workload (only 37 games started) is probably too low. Also, that would be 2 years in a row to Boston goaltenders. To put that into perspective, Carey Price has basically "lost" his starting job to Jaroslav Halak on MTL, this season, yet Price still has more starts (39) than Rask. (Howard has started 58 games). I think the Vezina will be Ryan Miller's award, and there are other guys like Bryzgalov and even Craig Anderson (whose numbers aren't all that great) who would be considered before Howard.
As for the "fairness" point, it's not unfair to factor in age and previous experience into the Calder. The whole point of a "rookie" award is that we are supposed to marvel at how advanced this player is so early in their career. Jimmy Howard has had NHL experience since the '05-'06 season. At several points, it looked like there was an opening for him to steal the backup or even starting position, but it wasn't until this season (and Osgood completely falling off the map) that he was able to secure a job. Howard's early career is impressive, but it's more akin to a post-hype prospect, like baseball's Adam Lind, or hockey's Guillaume Latendresse (Wild) than a true rookie performer.
I understand and accept his age will be used against him - but then they should go ahead and change the definition of a "rookie" if that is the case.
Age really should have nothing to do with the voting, when talking about which rookie is having the best season.