Goalkeepers have more of a mental than physical job. It's best to have someone who has a lot of experience standing around alone doing nothing for a long time (while not getting distracted by a bunch of jackasses constantly yelling at him), and have the experience and reflexes to suddenly respond instinctively and correctly, in a fraction of a second.
32 year old field players have already started deteriorating, but that is a prime age for a goalkeeper.
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Flower sniffing, kitty petting, baby kissing corporate rock whore.