Age, birthdays and life milestones
in one clear view.
7 calculators in this category · Browse by topic or open a tool directly.
Age Calculator
Calculate exact calendar age, total elapsed days and the next birthday from a birth date and an as-of date. Inputs stay in your browser.
CalculatorAge Gap Calculator
Compare two birth dates as completed years, months and days without changing the result as time passes. Inputs stay in your browser.
CalculatorDays Old Calculator
Count elapsed days, completed weeks and any custom day milestone from a date of birth. Inputs stay in your browser.
CalculatorGeneration Calculator
Map a birth year to a commonly used generation range while keeping its informal cultural boundaries explicit. Inputs stay in your browser.
CalculatorHalf Golden Birthday Calculator
Find the next half birthday, next birthday and date-based golden birthday from one birth date. Inputs stay in your browser.
CalculatorFull Retirement Age Calculator
Look up SSA full retirement age by birth date, including the January 1 prior-year rule and milestone date. Inputs stay in your browser.
Guide + calculatorBaby Age Calculator
Calculate chronological baby age in completed weeks, days, months and years without silently applying corrected age or milestones. Sensitive inputs stay in your browser. Verify important decisions with a qualified professional.
Guide + calculator