Is there such a thing as a child?

I like my response as to what I thought a child was. Then Lynda came and talked to us about her movie and it's concerns with children, books and nature. Then Sutter brought up a really interesting point in class the other day..."is there such a thing as a child." I almost want to say, "no there isn't." Children aren't really ever given the time to be children. From day one they are always learning something. They are constantly aquiring more and more knowledge on everything. So if this person is always learning something that is helping them mature, are they indeed, every considered a child? If they aren't, then what are they...young adults? Or if you indeed would call them children because they are constantly learning things, is there even such a thing as an adult. You don't ever stop learning. Everyone is constantly expanding there knowledge of something. Are we all children, since we are continuing to learn? Or does it only deal with literacy. So many questions roaming through my head and no definite answers...