I don't think they age physically, but can evolve as a person.
But still, and as much as I hate to argue with PBL, I beleive that all Imaginary Friends are always kids at heart. Even the extremasaurs (though they are more like angry 1 year olds). Even Mr Herriman acts childish from time to time. Wilt is totally a kid, he doesn't do anything else but play around all day. Sure, he helps Frankie once in a while, but that just makes him a good kid. Not growing up is kinda the point of Imaginary Friends. Because we have to. Mac'll someday have to get a career and a house, but Bloo will always be without a care in the world.
And seriously, who could imagine Cheese working in an office?
Memo: I like chocolate milk.
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Unconscious like a fox!
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