Age Gap Calculator
Enter two ages to see your gap, check it against the classic half-your-age-plus-7 rule, and get a shareable milestone fact.
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Age Gap📊 Your Result
Half-Your-Age-Plus-7 RulePractically Twins
Where the "Half Your Age Plus 7" Rule Comes From
A Century-Old Rule of Thumb
The formula — minimum acceptable partner age equals half your age plus seven — has circulated in etiquette guides and pop culture for over a century. It's not science, just a widely shared social heuristic for "is this age gap unusual."
Why It Only Applies One Direction
The rule sets a floor for the younger partner based on the older partner's age — it doesn't cap how close in age two people can be. That's why gaps under a decade almost always pass regardless of who's older.
Just for Fun, Not Relationship Advice
Real compatibility depends on maturity, life stage, and values — not a math formula. Treat this as a lighthearted conversation starter, not a verdict on any real relationship.
A Worked Example
Say one partner is 42 and the other is 29 — a 13-year gap. The rule says the 42-year-old's minimum acceptable partner age is (42 ÷ 2) + 7 = 28, so a 29-year-old partner technically passes.
The fun fact flips it around: when the 29-year-old was born, the 42-year-old was already 13 — just entering their teenage years. That kind of "what were they doing when you were born" framing is what makes an age gap feel bigger or smaller than the raw number suggests.
Frequently Asked Questions
What is the half-your-age-plus-7 rule?
It's a popular (non-scientific) dating rule of thumb stating the youngest age a person should date is their own age divided by two, plus seven. It's meant as a rough social guideline, not a hard rule.
Does the rule work for any age?
It works reasonably well for adults in their late 20s and up, but it produces odd results for very young or very old ages — always use common sense alongside it.
Is a big age gap automatically a problem?
No. Age is just one factor in a relationship. Maturity, communication, and shared values matter far more than a formula. This tool is for fun, not a judgment of any real couple.