Your life is not short every day; it only becomes short when enough days have already left.

The shortness of life is not something you feel daily. Days are long, weeks repeat, and the sense of scarcity only appears once a large amount has already gone, usually triggered by a birthday or a loss rather than by arithmetic. That delay is the whole problem, because urgency arrives late. Nothing about the rate has changed; only your perception of it.

Rather than waiting for that feeling, work out roughly how many more of something you are likely to get: summers, visits to a particular person, years in this stage of life. The number is usually smaller than expected. Let it inform one decision.