As an adult, it becomes easier to become cynical maybe even hopeless. Surely, neither quality is desirable but just a by-product of living in a fallen world.
When I'm at (or near) my worst, I sometimes resonate with Sgt. William James (main character in) The Hurt Locker as he talks w/ his baby boy.
Start watching at about 0:40. "But you know what, buddy? When you get older, some of things that you loved might not seem so special....By the time you get to my age maybe it's one or two things."