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You calculate your completed age in terms of the full years you have completed since your date of birth. So, if a person was born on 28 January 2001 then their completed age as of 23 September 2022 will be 21 years.

Age is calculated by counting the number of years, months and days completed since birth. Leaps years and months with 31 days are all factored in the calculations.

First we'll talk about when you do hyphenate an age: You do it when the age is acting like a noun and when the age is an adjective that comes before the noun and modifies the noun. In this example, the age?70-year-old?is used as a noun, and you hyphenate it: That 70-year-old with a purple hoodie loves Justin Bieber.

It is because "21 years old" is a noun phrase, as in "I am 21 years old," and so does not require hyphens, whereas "21-year-old" is an adjective phrase, as in "He is a 21-year-old man" and does require the use of hyphens, because as a hyphenated unit it describes a noun.

How to calculate age from date of birth. If you want to calculate age from your date of birth then put your birth date in above calculator and select today's date or other date what you want and click ?Go? button. This calculator will show your age by years, months and days.

So both '18 year old ' and /or '18 years old ' are correct depending on their usage.

Add hyphens when used as an adjective before the subject or when expressed as a noun. When using an age range, do not use an apostrophe. Examples: The man is 55 years old.

How do I calculate age in years, months, and days? Find the differences between the person's birth year/month/day and the current year/month/day: ... Replace them in the following formula: age = (years × 365) + (months × 31) + days . Divide the result by years from step 1 and truncate it to get the age in years.