I loved reading this and personally, I think you are very right. We DO need to live in the now and also look at the past and appreciate it ; )
I really liked that you said something about every age and what you learned!
I've thought about whether ignorance is bliss more times than I would care to admit. I would also constantly think about those people who don't think of all the problems in the world and how lucky they were not to have all of these worries. But I believe you're on to something when you say that without knowing how lucky you are do you ever truly appreciated your life.
Emily, I think your on to something. Your right that we need to live in the moment but still remember the past. I think a lot of people, like me, live more in the past or future. To worried about things that are unchangeable or, about what might be. But your right we need to live in the moment and appreciate what we have.