Phsyically, no, imaginaries don't age. This is evident from Mr. Herriman explaining to Mac and Bloo about the photos, given they don't change their appearance it's a waste of time to take a photo every year.
But aging as in, still celebrating a 'creation' day happens given the whole Arty incident. Even if it was a hoax, I like to believe the imaginaries to at least celebrate the day they were created. So they'd be a certain number or ages, even if there has been no physical change from when they celebrated their 1st birthday to say.. their 75th birthday.
But aging mentally? That's another issue all together. They obviously learn things as they go through the years. What's right, what's wrong, world around them etc. etc.
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