Age Difference Calculator: Calculate Age Gap Between Two People

Calculate the exact age difference between two people. Enter two birth dates to see the age gap in years, months, and days. Example: someone born in 1990 and someone born in 1995 have a 5-year age gap (exactly 5 years, 0 months, 0 days if same birth month/day). Useful for relationships, siblings, family trees, and friend groups. Works for any two dates.

Common age gap examples (age difference by birth year)

Here are typical age gaps with birth year examples. Use the calculator below for your exact age difference including months and days:

Age Gap	Example Birth Years	Common Scenario
1 year	1990 & 1991	Same grade in school, close siblings
2 years	1990 & 1992	Typical sibling spacing, dating couples
3 years	1990 & 1993	College year difference, sibling gap
5 years	1990 & 1995	Common age gap in relationships, siblings
7 years	1990 & 1997	Moderate age gap, sibling spacing
10 years	1990 & 2000	Generational sibling gap, age gap relationships
15 years	1990 & 2005	Parent-like sibling gap, May-December relationships
20 years	1990 & 2010	Generational gap, young parent to child
25 years	1990 & 2015	Typical parent-child age gap
30 years	1990 & 2020	Traditional parent-child spacing

Note: Age gaps vary widely across relationships, families, and cultures. The "typical" age gap in romantic relationships is 2-3 years, but gaps of 5-10+ years are increasingly common. Use the calculator for your specific birth dates.

Person A date of birth Person B date of birth Compare on date (optional)

Results update automatically

Want a quick estimate by birth year? Try the age by birth year charts.

Age gap calculator: common scenarios

Age gap in relationships

Many people use this calculator to find the age difference between romantic partners. Common relationship age gaps:

1-3 years: Most common age gap in couples (about 40-50% of relationships)
4-5 years: Noticeable but common age difference (about 20-25% of couples)
6-10 years: Significant age gap but increasingly accepted
10+ years: Large age gap, sometimes called "May-December" relationships

Age gap between siblings

Sibling age gaps affect family dynamics and childhood experiences:

1-2 years: Close in age, often play together, may compete
3-4 years: Common spacing, different school grades
5-7 years: Moderate gap, different developmental stages
8+ years: Large gap, older sibling may help parent younger

Age gap between friends

Friendships can span any age difference. The calculator helps you find exact gaps for: family trees, birthday planning, or just curiosity about age differences in friend groups.

How to use the calculator

Enter both birth dates to see:

Exact age difference in years, months, and days
Who is older and by how much
Optional: Each person's age on a specific date (useful for "how old were we when..." questions)

All calculations are performed locally in your browser. No birth dates or personal data are stored or transmitted.

More age tools

Age calculator — your exact age today (and age on any date).
Age in future year — how old you’ll be in 2030 (or any year).
Birthday countdown — days until your next birthday.
Age between two dates — exact difference between dates.
Retirement age calculator — estimate retirement date and time left.
Half birthday calculator — your next half birthday date and how many days until it.
Age in months — your total age in months (and optional weeks and days).

Age difference calculator: FAQs

How do I calculate the age gap between two people?

Enter both birth dates in the calculator. The tool shows the exact age difference in years, months, and days. Example: someone born January 1990 and someone born January 1995 have exactly a 5-year age gap.

What is a typical age gap in relationships?

The most common age gap in romantic relationships is 1-3 years (about 40-50% of couples). Age gaps of 4-5 years are also common (20-25% of couples). Larger gaps of 6-10+ years are less common but increasingly accepted. Use the calculator to find your specific age difference.

Is a 5-year age gap too much?

A 5-year age gap is relatively common in relationships and generally not considered large. What matters more is life stage, maturity, and relationship compatibility rather than the number of years. The calculator helps you see the exact difference — the rest is personal preference.

How do I calculate age difference in years and months?

Enter both birth dates in the calculator. Results show the full breakdown: years, months, and days. Example: born March 15, 1990 and July 22, 1992 = 2 years, 4 months, 7 days age difference.

What does "compare on date" mean?

"Compare on date" lets you see each person's age on a specific day (past or future) and the age gap at that time. Useful for questions like "How old were we both in 2010?" or "What will our ages be in 2030?"

Does this account for leap years?

Yes. The calculator follows standard calendar rules including leap years and varying month lengths for precise age difference calculations down to the exact day.

Do you store the dates I enter?

No. All calculations run locally in your browser. No birth dates or personal data are saved, transmitted, or stored on any server. Full privacy guaranteed. Learn more on our privacy page.