I think the reason for the rapid ageing is due to the Foxdie virus that was injected into.... whoops, wrong topic
In all seriousness, I think the reason for the rapid ageing is due to the stress of being Batman. He's a man who goes out night after night, takes a beating and "beats the bad guys to a pulp". All the battle scars that he has, he's tired and I think that's what they were trying to convey.
He's tired of being the Batman, wants to give up beign Batman and was looking for a replacement whom he thought he found in Harvey Dent. Then, he could get back together with Rachel and live a fairy tale life, happily ever after.
Either that or he's really aged. But come to think of it, he does look older in TDK than in the Terminator: Salvation trailer so its either intentional, or its movie magic!
Back to the topic at hand, I wonder if this suit and body will work, don't know if the body type etc fits. I kinda like the pinstripe. It just got released here in Malaysia recently.
I think the Bullet Ballet looks pretty good too.
Otherwise, I might go and hunt down that Enchanted Patrick Dempsey for the suit!