Find your exact age in years, months, and days
You are
1 months and 16 days old
13196
days lived
1885
weeks lived
433
months lived
317K
hours lived
Next Birthday
Turning 37
318
days away
Inputs
Result
From January 15, 1990 to February 3, 2026 is 36 years, 0 months, and 19 days. Total days = floor((today - birth) / 86400000) = 13,168 days. Weeks = floor(13168 / 7) = 1,881. Hours = 13168 x 24 = 316,032, displayed as 316K.
Inputs
Result
From July 4, 2000 to February 3, 2026 is 25 years, 6 months, and 30 days. Total days = 9,345. Weeks = floor(9345 / 7) = 1,335. Months = 25 x 12 + 6 = 306. Hours = 9345 x 24 = 224,280, displayed as 224K.
Your exact age is calculated from your birth date to today, accounting for leap years and varying month lengths. Example: Born March 15, 1990, as of January 29, 2026 you are 35 years, 10 months, and 14 days old - or 13,103 days total.
Age calculation sounds simple but has nuances. February birthdays require handling leap years. End-of-month birthdays (like Jan 31) must account for months with fewer days. Our calculator handles all these edge cases automatically.
Multiply your age in years by 365.25 (accounts for leap years), then add days for remaining months and days. Example: 30 years = ~10,957 days. Born January 1, 1995 as of January 1, 2025 = exactly 10,958 days (including leap years).
| Age | Approximate Days | Weeks | Hours |
|---|---|---|---|
| 20 years | 7,305 days | 1,043 weeks | 175,320 hours |
| 30 years | 10,957 days | 1,565 weeks | 263,000 hours |
| 40 years | 14,610 days | 2,087 weeks | 350,640 hours |
| 50 years | 18,262 days | 2,609 weeks | 438,300 hours |
Leap years add an extra day (Feb 29) every 4 years, except century years not divisible by 400. Over 30 years, leap years add 7-8 extra days. Our calculator handles this automatically for accurate results.
If you're born on February 29 (a "leapling"), you technically only have a birthday every 4 years. Legally, most jurisdictions consider March 1 as your birthday in non-leap years for age-related regulations.
Chronological age is your actual age in years/months/days since birth. Biological age measures how old your body functions based on health markers. You could be chronologically 50 but biologically 40 (healthy) or 60 (unhealthy).
| Type | What It Measures | Determined By | Can You Change It? |
|---|---|---|---|
| Chronological Age | Time since birth | Calendar/birthdate | No |
| Biological Age | Body function age | Health markers, DNA methylation | Yes (lifestyle) |
| Mental Age | Cognitive development | IQ tests, development | Partially |
Enter both dates (start and end) to find the exact time difference. Useful for calculating: Time married, time at job, pet's age, historical event timing, project duration, or time until a future event.
Key US age milestones: 13 (teenager), 16 (drive), 18 (adult, vote, military), 21 (alcohol), 25 (rent car, lower insurance), 35 (run for President), 59½ (penalty-free 401k), 62 (early Social Security), 65 (Medicare), 67 (full SS retirement).
| Age | Milestone | Significance |
|---|---|---|
| 16 | Driver's license | Can drive (most states) |
| 18 | Legal adult | Vote, military, contracts, tobacco |
| 21 | Full adult | Alcohol, gambling (some states) |
| 25 | Insurance drops | Rent cars, lower car insurance |
| 59½ | Retirement access | 401k/IRA withdrawal without penalty |
| 65 | Medicare eligible | Federal health insurance |
| 67 | Full retirement | Full Social Security benefits |
Date, time, and conversion tools
Last Updated: Feb 12, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.