I am constantly reminded everyday that I am an adult. In between those times I seem to forget. It's still strange to me that I moved from my home state last year, have my own place, pay my own bills, etc. I don't think it's necessarily denial of getting older, but more of just desiring to hold onto the carefree, worry-free blissfulness of childhood. If you lose that, then life isn't so much fun anymore.
Life is still worth living and fun just in a different way. Then again you did have a different childhood experience than me. Fred is sitting here with me and helping me type this:)