The formula for calculating age is usually based on the difference between the date of birth and the current date. The following is a simple age calculation formula: age = current year-year of birth.

This formula assumes that you have already celebrated your birthday this year. If you haven't celebrated your birthday this year, you need to add another year.

For example, if a person's date of birth is 1990 65438+ 10/and now it's June 2023 1, then this person is now 33 years old. This is because 2023 minus 1990 is 33 years old.

However, if a person's birth date is 65438+February 3 1 and today is 65438+1 October1,then the person is still 0 years old. This is because although he celebrated his birthday for one year, he hasn't really celebrated his birthday this year.

Some people may use more complicated formulas to calculate age, including considering the influence of birth month and date. For example, if a person's date of birth is 1 990 65438+February 3 1, and today is June 20231,then this person is now 32 and a half years old. This is because the negative 1990 in 2023 is 33 years old, but because he was born on the last day of the previous year, his age needs to be subtracted by one day.

Application of age calculation formula;

1, Demography: Demographers use formulas to calculate age to study population aging, population mobility and population trends. By understanding the number and proportion of people of different ages, we can analyze the changes and development trends of these people.

2. Medical research: In medical research, the formula for calculating age is used to evaluate the health status and disease incidence of people of different ages. By comparing the health indicators of different age groups, medical researchers can better understand the physical and mental health status of different age groups.

3. Sociological research: Sociologists use the formula of calculating age to study the social behavior, education level and labor market performance of people of different ages. By comparing the behaviors and performances of different age groups, sociologists can better understand the social and economic conditions of the population.

4. Anthropological research: In anthropological research, the formula for calculating age is used to study the growth, development and life cycle of people in different cultures and times. Anthropologists can better understand the development and changes of population in different cultures and times by understanding the age structure and life history of population in different cultures and times.