Calculating age manually may seem like a daunting task, but it’s easier than you think. Whether you want to determine your own age, the age of a family member or friend, or even the age of a historical figure, this step-by-step guide will help you do just that.

Step 1: Determine the Current Date

To calculate someone’s age, you’ll need to know the current date (including the day, month, and year). If you don’t know it off the top of your head, simply check your phone, computer, or any other device with access to a calendar. Write down the current date so you can easily refer back to it later.

Step 2: Find out the Person’s Date of Birth

To accurately calculate someone’s age, you need to know their date of birth (including day, month, and year). This information can be found on official documents such as birth certificates or driver’s licenses. It can also be determined by asking the person directly or obtaining information from friends or family members. Once you have this information, write it down (or keep it in mind) for reference.

Step 3: Subtract Years and Consider Time Between Birth Month and Current Month

Now that you have both the current date and birth date, start by subtracting the person’s birth year from the current year. This will give you an initial value for their age in years. However, remember that there might be some months left unaccounted for if their birthday has not yet occurred this year.

To account for this discrepancy, compare the person’s birth month to the current month. If the birth month is still in the future for this calendar year or is in the same month but they haven’t had their birthday yet (e.g., their birthday is September 20th and today is September 15th), you’ll need to subtract one year from your initial age calculation to reflect the fact that they haven’t yet completed a full year since their last birthday.

Step 4: Calculate the Remaining Months and Days

Next, if you want to calculate someone’s age more precisely in terms of months and days, follow these steps:

a) If the person’s birth month is still in the future for this calendar year, subtract their birth month from the current month and add 12. This will give you the number of months left until their upcoming birthday.

b) If the person’s birth month has already passed or is in the current month, simply subtract their birth month from the current month. This will give you the number of months that have passed since their last birthday.

c) For days, simply compare their birth day to the current day. If the birth day has not yet occurred this month, subtract it from today’s date and add the total number of days in their birth month. Conversely, if their birthday has already occurred, subtract their birth day from today’s date.

Step 5: Put It All Together

Finally, combine your calculations to express their age in terms of years, months, and days. For example, suppose someone was born on April 15th, 1990, and today’s date is September 9th, 2021. To calculate this person’s age:

1. Subtracting years: 2021 – 1990 = 31

2. Accounting for months difference: September > April (so no need to subtract a year)

3. Calculating remaining months: Current month (September – 9) minus Birth month (April – 4) = 5 months

4. Calculating remaining days: Today’s day (9) minus Birth day (15);