As the years go by!
From birth to around 20 years of age, you learn a lot at school, university, home, etc. The learning experience empowers you and you are ready to conquer the world.
From about 20 to 30 years of age, you set out to use your learning experiences to improve your life. You want to lead the world. You imagine yourself like Bill Gates OR You want to be the best Doctor or Scientist in the world! What an ambition! You even start to think that the only way you can be happy is by realising your goals. As you get to the end of your thirties, you wake up and start to look around you. What do you see? You see people! Loved ones! Then you realise that they are the only ones that can make you happy! You start to get your priorities right!
From 30 onwards, you start to make corrections and appreciate those around you more. You start to help people more because you never know what tomorrow will bring. You don't decide tomorrow! The fact that tomorrow comes is a big enough achievement!