About Age Since

Age Since started with a simple question: how long have I actually been alive? Not in years, which feel abstract — but in something visceral. Seconds. Heartbeats. Breaths. Miles traveled through space.

The answer is a number that hits differently than your birthday. You've been alive for over a billion seconds. Your heart has beaten two to three billion times. You've traveled roughly 10 billion miles around the sun. That's not small.

We built a set of calculators around that idea — tools that help you see your age from different angles:

• Age calculator — your exact age in seconds, heartbeats, breaths, blinks, and more
• Birthday countdown — how many days, hours, and minutes until your next birthday
• Dog years calculator — how old you'd be if you were a dog (it's not just ×7)
• Retirement countdown — how far away retirement is, down to the day
• Time since any date — elapsed time from any moment in history

Everything is calculated in your browser. We don't store your birthday, we don't have user accounts, and we don't track you. It's just you and the math.

We also write about time, age, and what it all means in our blog. Why years feel shorter as you get older. What happens at each decade. Birthday trivia. The kind of stuff that's genuinely interesting if you've ever stopped to think about how weird time is.