Studies show that we grow up psychologically quite naturally until about the age of twenty. Then, for reasons that are not terribly well understood, we simply stop growing. We remain at whatever psychological level of development we reached in our early twenties until the age of sixty or so, and then we start growing up again. Very few people actually grow up to the point of self-actualization. Currently only five percent of the world’s population is self-actualized or "fully" psychologically grown. There are things we can do between the ages of twenty and sixty to ensure we grow up psychologically fully. We need to do these things to become the very best version of ourselves we can be.