Life Milestones & Alternative Birthdays
Upcoming & Past Milestones
Why should we only celebrate once a year? "Metric Milestones" are just as exciting. Most people reach their 10,000th day around age 27. Reaching 1 billion seconds happens during your 31st year. These "Alternative Birthdays" offer a fun way to celebrate existence more frequently.
This tool scans your lifetime for round numbers in days, hours, and seconds. It gives you a calendar of dates to celebrate. For a mid-year celebration, check the Half Birthday Calculator. You can also see your age during Historical Events to see if your milestones align with history.
Milestone FAQ
When is my 10,000th day?
For most, it occurs 4 months and 15 days after their 27th birthday. Calculate your exact date above.
What is a billion-second birthday?
It occurs at age 31.7. Track your live count with Age in Seconds.
Why celebrate these?
They provide more opportunities for gratitude and reflection. See our Age Index for more time-based fun.
Can I calculate these for history?
Use the Historical Tool to see when events hit round numbers.
Is my 18th birthday a milestone?
Yes, track it on our Voting Eligibility Page.