@kibbeling
An incredibly deep and interesting question with quite the simple answer. There is no age where you suddenly figure out your life just as there is no age where you should.
This truly is a matter dependent on the person. Which I believe is the beauty in it as well! You don't have to worry about a time limit. As you'll figure it out when you need to! Everyone has their moment, and there will be one for you when you are ready for it!
I hope that answers your question adequately, @kibbeling!