# How old is that rating

> The sticker in the window may be years out of date.

- Category: Environment
- Cadence: monthly
- Status: Published on a monthly cadence.
- Dataset key: `hygiene-age`
- Source: [Food Standards Agency](https://ratings.food.gov.uk/)
- Licence: Open Government Licence v3.0 — [terms](https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/)
- Canonical page: [https://londongraph.com/g/how-old-is-that-rating](https://londongraph.com/g/how-old-is-that-rating)
- Machine-readable record: [https://londongraph.com/data/how-old-is-that-rating](https://londongraph.com/data/how-old-is-that-rating)

## Methodology

How long ago each London premises was last inspected, as a share of all rated premises. A rating is a snapshot of one day and stays on display until the next inspection, so the age of the rating is part of what it means — a five in the window from four years ago is a weaker claim than a five from last month.

## Visualisations

- [Rating age](https://londongraph.com/g/how-old-is-that-rating): Compare dated numeric ratings by elapsed-time band.
- [Age composition](https://londongraph.com/g/how-old-is-that-rating?view=composition): Show the same rating-age bands as an ordered 100% composition.
- [Borough age profile](https://londongraph.com/g/how-old-is-that-rating?view=borough-matrix): Compare rating-age shares across boroughs using each borough's exact dated-rating denominator.

## Citation guidance

Attribute the original publisher named above and identify LondonGraph as the visualisation and methodology layer. Do not describe live values as a historical census, and do not present placeholder values as observations.