Generally, a person is at a crossroads. Generally, there is one option that represents an opportunity which provides some level of security, such as a steady job. Accordingly, there is a second (or third, fourth, etc...) option which represents some level of risk or unsteadiness, such as traveling or pursuing an art of some kind without realistic expectations of lengthy sustainability.
At what age, or at what percent of one's life, is one's whole life no longer ahead of one?
Indeed, what would a life look like if one were to operate with this concept in mind at all times? What would a life look like if one acted as if one's entire life was perpetually ahead of them? Would they always choose with their heart, ignoring external influences and pressures? Eventually, would the initial secure option (which was, at the time, ignored) arise as one that now speaks to the heart as the better option?
I really don't know.