Study: Life begins when you are 50 years old

What are less happy years in the life of a man? When starting really happiness? A study by the Australian Institute of Family Studies disprove the old saying that "life begins at 40". In fact, according to the study, life begins 50 years.
According to data collected
by scholars up to the age of 15, people are satisfied. But after 20s, the satisfaction level falls significantly and continues the gradual decline until the age of 35 years.

After this age, being happy with life remains at minimal levels until reaching the 50s, when it starts to improve, which continues up to 80 years.