It's the perspective.

Everyone is born, everyone dies, that is the universal. It is how we fill the middle of that life sandwich that makes it worthwhile. Every new action and every new thought, whether positive or negative, that we bring into existence is so unique in that it has never been done or thought quite like we have done it. This is the way you can choose to view your life; as an infinite amount of unique moments that when it comes to the end of your life you realize you are leaving these with the world and also as a mark on the people you have touched, both in a constructive and possibly destructive way. One profound way I have seen this put was by the author and Holocaust survivor, Viktor Frankl. He explained the difference between optimists and pessimists in life as such; pessimists are those who look dishearteningly at the decreasing days on their life's calender and are sad about the remaining days. On the other hand the optimist looks both at the blank calender day in front of them as a blank slate for truly living life, but also they look upon all the past days of the calender they have cast aside. They look at this pile from their life with thoughts of happiness and fulfillment, of lives they have touched and the richness that has filled their days. This is why the person growing old has no reason to be jealous of the youth they see, "Instead of possibilities, I have realities in my past, not only the reality of work done and of love loved, but of sufferings bravely suffered. These sufferings are even the things of which I am most proud, though these are things which cannot inspire envy."
Life is meant to be lived. When people talk about their televisions being awesome and in HD, saying it's like what they're watching is almost real, I always think to myself: Go outside, look at the world, look at real people, Life is in HD!