Date of birth (DOB)
The DOB is the exact calendar date someone was born. A DOB of 29 February 2004 triggers automatic leap-year handling so age increments correctly every year.
Reference date
The reference date is the day you want to compare the DOB against. Setting it to 01 January 2030 helps you check retirement eligibility well in advance.
Chronological age
Chronological age counts the total time lived since birth. A person born in 1990 has a chronological age of 34 in 2024, useful for insurance pricing.
Age in months
Age in months multiplies years by 12 and adds the remaining months. Parents track a 2-year-old as 27 months for pediatric growth charts.
Age in days
Age in days is the total number of days alive, counting leap days. Couples celebrating 10,000 days married can plan celebrations to the exact date.
Milestone alerts
Milestone alerts flag upcoming age markers like 5,000 days or 40 years. They help schedule celebrations or legal reviews such as will updates.
Eligibility threshold
An eligibility threshold is the minimum or maximum age allowed for an activity. Sports academies may cap enrolment at 18, so precise ages prevent disqualification.
Leap year adjustment
Leap year adjustment accounts for 29 February every four years. Without this, someone born on 29 February would appear younger than they are on non-leap years.
Age verification report
An age verification report summarises DOB, current age, and critical milestones. HR teams attach it to onboarding files to meet compliance standards.
Life expectancy benchmark
A life expectancy benchmark compares current age to average lifespan—say 70 or 80 years—helping planners discuss health insurance or retirement readiness.