How age calculator works
This age calculator finds the exact time between two dates — your date of birth and a target date (today by default). Rather than simply dividing the total days by 365, it walks the calendar month by month so the result reads naturally as "years, months and days", correctly handling months with different lengths and leap years.
To compute the difference, the calculator starts from the birth year and counts full years until the target year. It then counts full months, and finally the remaining days — borrowing from the previous month when the target day is earlier than the birth day. The total number of days you've been alive is shown separately, along with a countdown to your next birthday.
Everything runs in your browser. No date of birth is ever sent to a server, so it's safe to use for personal or sensitive dates. You can also pick a custom "age at" date to answer questions like "how old will I be on a specific date?" — useful for eligibility checks, retirement planning, school enrolment deadlines, or anniversary milestones.