Pursuit of Happiness

For everything that is complete today is likely to be torn tomorrow. Trusting, believing are the natural instincts that arise when you don't want to go any further in pursuit of that extra quality that you may otherwise get. When do you give up? At the age of 50? When you probably think you are off the age to pursue that extra piece of knowledge which can make you being counted in the elite group of people whose stories every person want to read to thrive in their endeavors? Where does it all end? For me (at least thinking wise), the tale is never ending. Whenever you achieve, it becomes a point of new career endeavors. I don't know, but at this early stage, life at times suddenly makes me take a pause, feel stagnant may be to enjoy the surroundings which I otherwise may not be able to during my quest of growth. How do you justify/characterize such aspects in your life?