According to Wiktionary, a turning point is "a decisive point at which a significant change or historical event occurs, or at which a decision must be made" . There are several turning points in one's life which have the ability to shape one's life and destiny. Not all of them happen at proper time and age though, as some of them occur when you are not aware and wise enough to turn to the right direction. But what does "right direction" really mean?
I believe "right" means you looking back - after you have already chosen the direcion and walked through the way and come across the consequences of your decisions - and feeling happy with yourself, your inner true self, and feeling that if you reached the same point again, you would still turn to the same direction. This is not a very easy concept though, as we've been trained to put so many other things before ourselves, going with the society's rules, keeping other people happy, not to change the portrait that other people know from us, playing the role that we play in our everyday life, etc. But if we can clear these clouds away, see our true self and know it, then we can judge much more truly.
Overall, looking back at the turning points and finding them in your life, and checking back the decision that you made then and there and considering all the consequences, at least can provide a pattern or a map which might help finding and predicting the points ahead, and hopefully making better decision for them.
...and it was very intersting for me when I saw a new book from "Garry Kasparov": "How life imitates chess" and found out that somebody else, somewhere else in the world, with a different nationality and culture and profession from me, has thought exactly about the same concept, with a similar approach :
"...Such decisive moments are tuning points- every time you select a fork in the road knowing you won't be able to backtrack. We live for these moments and in turn they define our lives. We learn who we are and what truly matters to us.... Developing your personal blueprint allows you to make better decisions, to have the confidence to trust your instincts, and to know that no matter the result, you will come out stronger. "
Shall I join the club, Mr. Kasparov?