Professionals Know Best?

I was reading an article in a psychology journal the other day that I couldn't quite agree or disagree with. It was talking about how the most defining events in a person's life are the events that you can set a date to; deaths, births, weddings, etc. To help demonstrate it told the reader to think of the first date of a major life event that came to mind besides their birth date (the date that came to my mind was November 12). It then instructed us to think of how that event has weighed on everything in our life, including personality and attitude, since then. It then told us to try to predict how it would factor into our future lives. While I understood how November 12 has influenced everything in my life since and will until I die, I also somewhat disagreed. There are many things in my life that I can't set a date to yet I find them almost as defining or more so. I can't tell you when certain people became my best friends but their influence has been constant and will persist even after they are gone from my life (if they are). The article didn't dismiss these things as not influential, but as less influential just because it isn't necessarily a single pivotal moment. I have a hard time agreeing. And I would put a link to said article but I unfortunately can't find it anywhere on the web so the writers can't defend their position to you. But you have a very brief summary of my musings on it :)