Age Calculator
Calculate your exact age in years, months, and days. Find out how many days until your next birthday, your age in total days, weeks, and hours, and compare two different dates.
How Age Is Calculated
Age seems simple — you subtract the birth year from the current year — but the accurate figure requires accounting for whether the birthday has occurred yet this year, the varying lengths of months, and leap years. Legal and official documents always use the exact date of birth, so precision matters.
In Australia, age is legally calculated as the number of complete years from the date of birth. A person born on 15 June 1990 does not turn 35 until 15 June 2025, regardless of whether they were born at 11:59 PM. This is known as the "anniversary rule."
Why Exact Age Matters in Australia
There are numerous Australian legal and financial thresholds tied to specific ages. Knowing your exact age — or the exact age of a child or beneficiary — is important in several practical situations.
Key Age Thresholds in Australia
| Age | Significance |
|---|---|
| 16 | Legal age to work full-time in most states |
| 17 | Age to apply for a learner driver licence (most states) |
| 18 | Legal adulthood; voting; purchasing alcohol; signing contracts |
| 21 | Historically considered full adulthood; some trust deed triggers |
| 60 | Eligible to access superannuation under some transition rules |
| 65 | Eligible for Age Pension (increasing to 67 by 2023) |
| 67 | Current Age Pension eligibility age |
| 75 | Upper age limit for non-concessional super contributions |
Worked Example 1: Standard Age Calculation
Suppose someone was born on 14 March 1988 and today is 23 April 2025.
- From 14 March 1988 to 14 March 2025 = 37 complete years
- From 14 March 2025 to 23 April 2025 = 1 month and 9 days
- Exact age: 37 years, 1 month, 9 days
In total days: 37 years × 365.25 (accounting for leap years) + the remaining 40 days ≈ 13,553 days.
Worked Example 2: Age at a Past or Future Date
This tool lets you calculate age as of any date — not just today. This is useful for:
- Checking how old you were on a particular historical date
- Calculating whether a child will have turned 5 before the school enrolment cutoff date (varies by state)
- Checking whether a beneficiary has reached the age specified in a will or trust
- Verifying eligibility for age-based government payments at a specific date
Example: A Victorian school enrolment cut-off is typically 30 April. A child born on 12 June 2020 would be 4 years, 10 months, and 18 days old on 30 April 2025 — not yet 5, so they would not be eligible to start Prep until 2026.
School Starting Age by Australian State
Each state and territory sets its own rules for when children must start school. These are based on age at a specific cut-off date, making an age calculator genuinely useful for parents planning enrolment.
| State/Territory | Must Start School By | Age Requirement |
|---|---|---|
| NSW | Start of school year after turning 6 | Must be 5 by 31 July to start that year |
| VIC | Year child turns 6 | Must turn 5 by 30 April |
| QLD | Year child turns 6 | Must turn 5 by 30 June |
| WA | Year child turns 6 | Must turn 5 by 30 June |
| SA | Year child turns 6 | Must turn 5 by 1 May |
| TAS | Year child turns 6 | Must be 5 by 1 January |
| ACT | Year child turns 6 | Must turn 5 by 30 April |
| NT | Year child turns 6 | Must turn 5 by 30 June |
Note: Rules change periodically. Always confirm with your state's education department.
Superannuation and the Preservation Age
Your superannuation preservation age is the earliest you can access your super under a transition-to-retirement income stream or once you have permanently retired. This is determined entirely by your date of birth.
| Date of Birth | Preservation Age |
|---|---|
| Before 1 July 1960 | 55 |
| 1 July 1960 – 30 June 1961 | 56 |
| 1 July 1961 – 30 June 1962 | 57 |
| 1 July 1962 – 30 June 1963 | 58 |
| 1 July 1963 – 30 June 1964 | 59 |
| After 30 June 1964 | 60 |
Frequently Asked Questions
Leap years add an extra day (29 February) every four years. When calculating total days lived, each leap year contributes 366 days instead of 365. For people born on 29 February, most systems treat their birthday as 28 February or 1 March in non-leap years depending on jurisdiction.
As of 1 July 2023, the Age Pension qualifying age is 67 for both men and women. This applies to people born on or after 1 January 1957. The qualifying age was gradually increased from 65 over the preceding years.
Australian law uses the "anniversary rule": you reach a certain age on the anniversary of your birth date. You are 18 on your 18th birthday, not the day before or after. Some legislation specifies the exact moment (start of the birthday, or midnight at the start of the day).
For anyone born after 30 June 1964, the preservation age is 60. You can access super at 60 under a transition to retirement strategy if still working, or fully once you retire after 60. Everyone can access super unrestricted at age 65, regardless of employment status.
Yes. Simply enter any date of birth and any reference date. The tool works for calculating a child's age at school enrolment, a parent's age at retirement, or any other age-related calculation.