Time is so long when you are young. An hour can be an eternity. A day can be a series of great adventures. A week, a month, a summer, a school year can be so far in the future that a young child will not even stop to consider them. Looking forward, time stretches out forever until you're an old person of maybe 30.
Time is so short when you get older. It's funny how the term “old” takes on different meaning as you get older. Old used to be 30 then 40 and seemed to move up decade by decade. When you know that you are looking back on more than you have to look forward to, you are on the downward slide. Years fly by. Decades may be hard to crystallize in your thoughts looking back. The past is so full of memories that crowd in upon one another that you have a hard time distinguishing the time line of events.
Suddenly the summer is over and you face another winter. All the best plans of all that you were hoping to accomplish will have to wait for another time. It's not sad to see the seasons and years pass by so quickly. You get comfortable with yourself and your surroundings and you have your friends and family and you have your memories that you built back when time was unending and stretched out forever.
If you're fortunate, you didn't waste too much of your youth and enjoyed each day as it passed. It doesn't take much to notice just one thing each day that makes that day different from all the others.