You must NOT get rid of your Lego and Bionicle pieces, even if everyone in Australia thinks you should. People who say this are not very intelligent. It's a great thing, Lego. And as I said before, there's no age to like Lego and Bionicle and to MOC. Look at Black Six, our forum administrator. He's 23. So, keep MOCing please.
And personally, my parents are okay and let me get Bionicles. They like my MOCs, and my father admired my sets. Anyway, I will NEVER get rid of my pieces.