Age gap
The age gap is the difference between two birth dates. A gap of 3 years, 8 months guides how siblings align in school cohorts.
Older/younger indicator
The older/younger indicator clarifies who was born first. HR teams use it to verify seniority when benefits depend on service time.
Chronological comparison
Chronological comparison looks purely at calendar dates, not maturity. It ensures fairness when applying age-based rules.
Shared milestone
A shared milestone is an event both people reach together, such as 10,000 days lived. It provides creative celebration ideas.
Leap-year adjustment
Leap-year adjustment accounts for 29 February. Couples born in leap years still get accurate day counts without manual correction.
Age ratio
An age ratio compares ages as a proportion. Parents gauge how a 6-year-old relates to a 9-year-old sibling in developmental planning.
Anniversary tracker
An anniversary tracker highlights upcoming joint celebrations, like 5,000 days since meeting. It aids event planning.
Reference alignment
Reference alignment means choosing a specific date for comparison. Teams evaluating age on a policy renewal date rely on this alignment.
Age variance
Age variance is the spread between ages in statistical studies. Researchers use it to measure generational gaps in surveys.
Life stage grouping
Life stage grouping categorises people by age bands (e.g., early career vs. mid-career). Knowing the precise gap keeps groups consistent.