The relationship between age and happiness is U-shaped . Ina recent study , data from 95 developing countries and 36 advanced countries have been analyzed to conclude that there is a universal "happiness curve" in life, a U-shape that reaches its lowest point in middle age.
The crisis of 40
The crisis of the 40s does not seem like a myth . The crisis of the 40s has been located in very different cultures, so it does not seem to be something inherent in modern societies.
It is the moment in which we consider whether we have fulfilled all the expectations placed on our life, the age in which we take stock and we consider that we could have paved the way to places that have finally been forgotten.
Gone is the happiness we enjoyed when we were 20. In our youth, everything is a new experience for us. Fortunately, little by little, we will start to be happier and happier starting at 40, year after year, until we reach 70 and beyond .

It is around fifty years when we begin to climb the wall of that "U". It does not matter the social class to which one belongs or the type of family that one has formed.
In old age we realize what was worthwhile. It is at that moment that we have adjusted our expectations regarding what life can offer us when we know what we can achieve and what we cannot. According to the study, when people reach 69 years of age they tend to see the past with better eyes.
Their reality is usually better than the expectations they had and they are happier with what they have achieved .