👉 Age math is a simple yet useful concept that helps us estimate the age of someone based on their birth year and current year. To calculate someone's age, you subtract their birth year from the current year and then divide by 365 (accounting for leap years, which occur every four years). For example, if someone is born in 2005 and it's now 2023, subtracting 2005 from 2023 gives you 18. Dividing 18 by 365 results in approximately 0.0498, which rounds to 1 year. However, this method doesn't account for leap years, so it's best used for quick estimations. For more precise age calculations, especially over longer periods or with varying birth months and leap years, you can use more complex formulas.