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I don’t think that one loses a sense of appreciation for art as one grows up. It would rather be more appropriate to say, as Kant puts it, that it depends on/colored by the immediate state of mind of the observer. The same piece of music/poetry that pleased you when you were young may hold little meaning or may look even more interesting when you are grown up! Also, the same thing which pleased you just a month back when you were relaxed and in a good mood may not impress you to the same extent today when your mood is off or when you are busy in some thing that is more important to you at the moment. The mind is in a constant state of flux and a varying entity. At any given moment, it’s the inner feeling or the state of mind that is most important thing in perceiving the world around us and that principle works not only in case of art but everything. In other words, the world as one sees or feels it is nothing but how one’s mind perceives it.

In other words,it is difficult to assign any objectivity to such things and it’s all mostly subjective!

I am sorry if I sound being a bit philosophical or cynical in giving my views on your query.

I feel that we do loose ‘some’ level of sense of art appreciation and the reason for that seems to be that at a younger age - we are more open to learning ‘different’ ideas and hence are able to appreciate the uniqueness in different forms of art. As we grow older and our views about things in life start to ‘solidify’ we are unable to look/feel and appreciate the uniqueness of art to the same degree…
On the other hand you can choose to continue to be ‘young at heart’, learn new stuff and visit learnhub regularly :)