Free Age Calculator 2025 – How Old Are You Today?
Instantly calculate your exact age, body age & mental age. Works in the USA, UK, Canada, Australia & worldwide.
Chronological Age – Exact Age From Date of Birth
Enter your date of birth and an optional “calculate on” date. By default we use today so you can answer the classic question: “How old am I right now?”
Body Age Calculator – How Old Is Your Body?
Answer a few lifestyle questions to estimate your biological body age. This is just an educational tool and does not replace medical advice.
Mental Age Test – How Old Is Your Mind?
This quick, fun quiz estimates whether you are young at heart, perfectly balanced, or more of an old soul.
Online Age Calculator – More Than Just Years and Birthdays
This free age calculator is designed for anyone who wants an instant, accurate answer to “How old am I?” and “What is my age today?”. Instead of counting birthdays manually, the tool uses your date of birth and a target date to calculate your exact age in years, months and days – including leap years.
The calculator is perfect for school projects, work forms, visa and immigration documents, retirement planning, sports eligibility, pregnancy calculations, insurance applications and more. Because it shows age in different units, you can quickly see how many days old you are or how many weeks have passed since a special date.
In addition to chronological age, this page includes an educational body age calculator and a light-hearted mental age quiz. These extra tools help you reflect on your lifestyle and mindset, and are popular for social media, birthday parties and fun comparisons with friends and family.
Main features of this age calculator
- Exact age from date of birth to any date
- Age in years, months, weeks, days, hours, minutes and seconds
- Day of the week you were born
- Days remaining until your next birthday
- Body age (biological age) estimation based on lifestyle
- Mental age test to see how young or mature your mindset feels
- Downloadable TXT and CSV age reports for printing or saving
CalculatorForYou.online is optimized for mobiles, tablets and desktops, so you can check your age calculations anywhere. No login is required and your inputs are not stored on the server – everything is calculated in your browser.
Age Calculator – Frequently Asked Questions
How do I use the age calculator?
Enter your date of birth, choose an optional “calculate age on” date, then click Calculate Age. The result card will show your exact age and all other units.
Can I use a past or future date?
Yes. You can calculate your age on any date in the past or future, as long as it is not before your date of birth.
Is the body age calculator a medical tool?
No. It is only an approximate estimation based on lifestyle questions. It cannot diagnose or treat any condition. Always speak to a doctor about your health.
Why do you show so many units (days, hours, seconds)?
Many people enjoy knowing exactly how many days or weeks old they are. It is also useful for research, statistics and planning.
Does the calculator work for leap day birthdays (29 February)?
Yes. The date difference logic includes leap years, so people born on 29 February will still see accurate age results.