The thought that every single one of us has an invisible clock counting down and nobody knows when it hits zero. I didn't get this until age 35. Before that, time felt infinite. You waste entire years on the wrong thing. The wrong person. The wrong company. Then one random Tuesday you realize you might be halfway done. Maybe more. No one knows. Your high school friends are having their second kids. Your parents' friends are dying. That feature you shipped five years ago, well, the entire company doesn't exist anymore. We all walk around pretending we have time. But the guy who cut you off in traffic this morning....his clock might run out tomorrow. The founder grinding 80-hour weeks...maybe has 40 years left. Maybe 4. The weird part is knowing this changes everything. Once you see the clock, you can't unsee it. So you stop optimizing for someday. Start shipping today. Text the friend. Build the thing. Take the risk. The clock's ticking anyway. Might as well make it count. That's what I realized at 35. Not that time is short. But that knowing time is short is actually the unlock. It fires me up, maybe you too.