How is age calculated?

Age calculation, generally, involves determining the elapsed time between a person's birthdate and a specific current date. The method described below calculates age in days initially, then converts it to years.

Calculation Process

The process, according to the provided reference, can be broken down into these steps:

1. Calculate days:

   • Find the difference between the current day and the birth day. This is represented as: days = current day - birth day.

2. Calculate age in days:

   • Use a formula that considers years, months, and days: age in days = (years × 365) + (months × 31) + days.
     • Note: This method uses a simplified approach for months and years. It assumes 365 days in a year and 31 days in a month.

3. Calculate age in years:

   • Divide the age in days by 365 to get age in years.

Example

Let's consider a simplified example:

Input	Value
Current Date	January 18, 2024
Birth Date	January 18, 2000

Using the provided information, we would first need the days difference, but since we have the full birth date the days difference is zero.

1. Days Difference:
   Since the day of birth and current day are the same there is no difference in days.

2. Age in Days

   • Years Difference = 2024 - 2000 = 24 years.
   • Months Difference = 0
   • age in days = (24 × 365) + (0 * 31) + 0 = 8760.

3. Age in Years:

   • Age in years = 8760 / 365 = 24.

In this simplified example, the age is 24 years old.

Limitations

• The formula age = (years × 365) + (months × 31) + days uses a simplified approach by assuming that each year has 365 days and each month has 31 days, it doesn't account for leap years and variable month lengths, which introduces a minor inaccuracy into the calculation. The exact answer should be calculated with exact dates including specific month lengths and leap years to be fully accurate.

• This approach is a general estimation of age and might be different from actual ages calculated by different methods.