To determine how old someone is, it is necessary to know their date of birth. The age is calculated by comparing the birth date to the current date, usually resulting in the number of completed years. For example, if the birthday has already occurred in the current year, age is simply the current year minus the birth year. If the birthday has not yet occurred this year, one year is subtracted from that difference. If the exact date of birth is provided, age can be calculated more precisely including months, days, and even hours or minutes. Without the birth date, it is not possible to determine the exact age. Please provide your date of birth to calculate how old you are. If only the year of birth is known, an approximate age can still be given based on the difference from the current year 2025.