How old were you in the first half of your life?

The first half of my life was before I was 40.

The dividing line between the first half and the second half is 40 years old, the first half is before the age of 40, and the second half is after the age of 40.

Life is the process that human beings go through from birth to death. In this process, we must go through ups and downs, joys and sorrows, joys and sorrows. Only in this way can we live a real life. A person's life can't be smooth sailing. It can also be said that a person's life is a process from immaturity to maturity and then to sophistication.

Age calculation method

With the extension of the average life expectancy of the global population and the intensification of aging, WHO has redefined the age stage, stipulating that young people are under 44 years old, middle-aged people are 45-59 years old (prime of life), young people are 60-74 years old, real old people are 75-89 years old, long-lived people are over 90 years old, and centenarians are over 0/00 years old.

Nominal age.

China's customary age calculation method is based on the calendar year after birth, that is, even if he was born in 1 year, he will increase 1 year every New Year. Generally calculated according to the lunar calendar, but also calculated according to the Gregorian calendar.

For example, a baby born at the end of 65438+February is 1 year after birth, or 1 year after the Gregorian calendar or the local Chinese New Year. In this way, the baby is only a few days old and is already 2 years old. This method of calculating nominal age is simple, but unscientific.

One year old.

Also known as full age, it refers to the number of anniversaries or birthdays experienced from birth to calculation.

For example,1A census was conducted at 0: 00 July 1990, and1A baby born in February 1989, with a nominal age of 2 years. Actually, it's just been more than six months, and I haven't celebrated my birthday yet. According to one year old, it should be less than 1 year old. One-year-old age is often 1 ~ 2 years younger than the nominal age, which is a commonly used age calculation method in population statistics.