1) When we are young, we feel there is an infinite amount of time. We have our whole life ahead of us. More days are to come than we have lived. We will always have time to do certain things, to accomplish things and to even say things. This why procrastination is found more often in young people than older folks Those who have lived life have realized that time tends to pass us by much more quickly than we anticipate. And seasons only last for 3 months before the next season arrives.
2) When we are young, we feel that every single second matters and if we waste one moment, we will never get it back and we will never make it up. If I get sick and miss a day of practice, I will never get that day back and I will never reach my full potential. If I miss out on this one experience with friends, it will never be made available again. This is why we see younger people rush around much more than older folks. We think it is because they are old and slow. The truth is that they have rushed around themselves and have found that it is a waste of energy. Seasons come and then go but they do come around again and sometimes they are better than the previous year.
As we get older, we realize that both are true in their own way. Time is not as infinite as we think it is and we need to make a conscious effort to take advantage of every opportunity that we have. Also, if we miss something, we must be content and know that every moment isn't a "make or break" moment in time.