Age Difference Calculator

Calculate exact age gap among two persons, based on their ages, years of birth, or birth dates.


Birthday of First Person

Birthday of Second Person

Created by Helen Stark
Helen Stark
Helen Stark

Student of Harvard university, she loves to observe new things about society, she studies Wikipedia more and learns about quantum physics on the internet. She loves dancing and singing songs.

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Reviewed by Nick Walker
Nick Walker
Nick Walker

Done PHD of nuclear physics from the University of Pennsylvania. He is always seeking ways to explain science in easy terms. Moreover, he loves coffee & its beans more than his girlfriend (not at all).

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With the age difference calculator, you can find out how much age gap exists between two persons. A quick way to exactly find the length of time between two birthdates. 

Age Difference Formula:

You can calculate age difference between two people by the following formula:

Age Difference = |First Person Age - Second Person Age|

The absolute function “||” indicates that age difference is always a whole number.


If person A is 76 years old and person B is 23 years old, then their age difference will be:

Age Difference = |First Person Age - Second Person Age|

Age Difference = |76 - 23|

Age Difference = 53 Years

Find Age Difference with the Calculator:

Let’s suppose you want to calculate age gap of two persons. This age difference calculator can do it in seconds, such that:

  • You have three different options to find age differences with this tool, including “Birthdays”, “Years”, and “Ages
  • Choose and add values accordingly
  • Make your choice and enter the required inputs accordingly
  • Click “CALCULATE” and you will get the age gap

It’s that easy!

Age Gap In Relationships:

Studies have revealed that an age gap of more than 10 years among partners is socially disapproved. But it does not mean that every woman or man thinks like that. Everyone has set their preferences and even lives happily with the 15-year age gap.

Do Age Gaps In Relationships Matter?

  • It depends upon the thinking of couples. Where less age-gap couples have weak bonds, those with greater age-gap are likely to survive happily. About three-fourths of the total couples where an old man is married to a younger woman are satisfied. Such people do not even get jealous of the age factor or anything like youngsters of the same age.
  • In relationships, social disapproval of large age-gap couples by family members, friends, or the community also affects commitment. This increases the chances of break-ups. This is why before you tie with your partner, it is important to know what is the age difference between both of you. 
  • Also, the life stages matter a lot and play a significant role in couples. For example, a fifteen-year gap between an 18-year-old and a 24-year-old may bring up different challenges and issues than a fifteen-year gap where one partner is 34 and the other is 26.

The Rule of Seven - Find Age Gap In Relationships

This rule states that:

“Never date anyone under half their age plus seven years”

For example: If you are 25 years old and your dating partner is 27 years old, then according to the rule:

25/2+7 = 12.5+7 = 19.5 years

It means you being 24 years old should not date anyone who is under 19.5 years old.

Age Difference Between Married & Unmarried Couples:

As per the research conducted by America’s Families and Living Arrangements: 2012, the difference between married and un-married couples is as follows:

Age difference Unmarried couples (thous.) Married couples (thous.) Unmarried couples (%) Married couples (%)
Male 10 or more years older than female 852 4,576 10.86 7.5
Male 6 to 9 years older than female 1,010 6,935 12.87 11.36
Male 2 to 5 years older than female 2,237 20,516 28.51 33.61
Within 1 year of each other 2,234 20,344 28.48 33.33
Female 2 to 5 years older than male 830 5,981 10.58 9.8
Female 6 to 9 years older than male 364 1,682 4.64 2.76
Female 10 or more years older than male 318 1,013 4.05 1.66
Total 7,845 61,047 100 100

Table Reference: