A whole lot of people often takes some really important things with levity and less enthusiasm, or even do the right thing at the wrong time, and still expect a positive result with such approach.
Take for instance, a man at age 70, saying he's training to be a soccer player and will like to win the world cup. Sadly this dream and wish of his, is one a much more younger individual can achieve with some level of determination, hardwork, persistence and a bit of luck on his side, but this is not the case with the man at age 70, because even if he may be physically strong, he no longer has time on his side, and he could have achieved such dream years ago, if he had started way earlier.
In other words, such case is like looking for a black item in the dark without any light available.
Time waits for no one, it's smarter to grab an opportunity while it lasts, because when lost, it may never be regained.
We only live once, whatever good opportunity arises, grab the bull by the horn, you will be grateful in time to come.