To determine how old someone will be, the key information needed is their date of birth and the date for which they want to know their age. The basic way to calculate age in years at a given year is:
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If the birthday has already occurred in the year:
Age = (Year of interest) - (Birth year) -
If the birthday has not yet occurred in the year:
Age = (Year of interest) - (Birth year) - 1
For example, if someone was born in 2005 and the year of interest is 2025, if their birthday has passed in 2025, they will be 20 years old; if not, they will be 19 years old. If you provide your birth date or birth year, it becomes possible to calculate your exact age now or any future age with precision. Without your date of birth, an exact answer cannot be determined. Several online calculators allow entering birth date and a target date to find exact age in years, months, days, or even seconds.
If desired, please share your birth date or birth year to find out exactly how old you will be at a certain time.
