“The sunset you are seeing now, you will never see again.” Think about all that makes up the sunset.
First of all there is the time before, at and following the setting of the sun. This is what makes the colors we so enjoy. The light is always different and the direction as the sun sets changes every day.
“You have never been older, and you will never be this young again.” Your day, the activities, the people, the location, the clothes you are wearing and the food you are eating is different from the previous days. It will never be the same in the future. You will never see or feel yourself this very same way again, ever in your life. That is a really awesome thought.