The problem is that in the vast majority of cases, unless you managed to build something successful by the time you die, then your work will die with you and nobody will care.
The article makes the tempting assumption that progress is monotonic, and that the work that you do will eventually find its use. I don't think this is right -- the vast majority of stuff ever created gets thrown away or forgotten. In this sense, you are running out of time: you have only so much time left to accomplish something which will really survive you.
(Note that this applies to intellectual achievements, not so much to building a family and the like.)