You may probably wake up very late in the morning. If you also go to bed very early, you may find that you have too little time every day. You may probably use up your time in the day for doing useless thing, meaningless thing, like idling and talking gossip. Have you ever calculated the way you use your time?
Everybody shares the same time every day, but the difference is the way people use the time. Diligent people may use their time wisely to achieve their life goals. Some people may dwell in the dream sweetly, but not doing anything for making their dreams true. Such is a very pitiful thing in life.
Life is in fact quite short, though. People nowadays are quite difficult to pass through their old age. How old can you live up to? Not sure about this. But you can decide how you will spend your day. That's the shortest part of your whole life. We don't really have to think and make planning for the whole life. We should start planning for short term before making long-term planning.
Plan and do and change accordingly. Life is also a great knowledge about how to live and adapt to change. We might think that a thing can be done later, but when this thought arises, you have already wasted your time. And perhaps, you are going to keep on wasting your time. Dreadfully, you might keep on wasting your time for the rest of your life. And then died regretfully for not really cherishing every moment in life.