# Is there really no participant birth year data?

Since data freeze 11 (DF11) there is APPROX\_BIRTH\_DATE variable in the [minimum extended phenotype data](/finngen-data-specifics/red-library-data-individual-level-data/what-phenotype-files-are-available-in-sandbox-1/minumum-extended-phenotype-data.md) file.

This variable does not exist in earlier data freezes, but you can calculate birth year easily from all individuals using longitudinal data. Each event has the APROX\_EVENT\_DAY and EVENT\_AGE, so by computing `APROX_EVENT_DAY - EVENT_AGE` you should be able to get birth year from any of your desired endpoints.


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.finngen.fi/faq/about-finngen-data/is-there-really-no-participant-birth-year-data-in-sandbox.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.