A population chart with its assumptions showing

The chart began as a daily way to make the scale of a lifetime visible across familiar U.S. birth-year groups. It is intentionally simple: the same formula, advanced by one calendar day, with a source and version trail anyone can inspect.

The useful object is not a dramatic countdown. It is the combination of the chart, the crawlable values, the declared method, and the research notes explaining where interpretation should stop.

Life Days Left is an independent public project published through @lifedaysleft ↗. The same project maintains the calculation, daily chart, methodology, and editorial material on this site.

The project does not collect personal health or income information to generate the displayed estimates. Every visitor sees population-level outputs from the same fixed model settings.

• Prefer primary research, official government tables, and the source authors’ own documentation. Link them beside the claim they support.
• Label the active model version and distinguish a source update from the daily passage of time.
• Keep publication and material-update dates visible. Do not refresh dates when the substance has not changed.
• State uncertainty and omitted variables in plain language. Do not turn observational associations into causal or personal claims.
• Correct calculations and source descriptions in the page where they appear, then update the model or article date when the change is material.

To flag a possible error, contact @lifedaysleft ↗ with the page URL, the disputed statement or value, and the strongest primary source you have.

Life Days Left is not a death clock, clinical tool, insurance model, financial plan, or individualized actuarial assessment. It cannot know how long a person will live and should not influence care or other high-stakes decisions.

Health, circumstances, structural conditions, and chance do not fit inside one bar. The estimate is an illustration of a declared population model—and should be read only at that altitude.