> For the complete documentation index, see [llms.txt](https://docs.finngen.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.finngen.fi/faq/about-endpoints/i-found-bl_age-after-fu_end_age-in-the-endpoint-data-how-is-it-possible.md).

# I found BL\_AGE after FU\_END\_AGE in the endpoint data, how is it possible?

This can happen when an individual gives biobank sample after register follow-up ends. For example, if FU\_END\_DATE is 11.10.2021 (DF9), and individual gives sample to biobank in year 2022, then the BL\_AGE is currently after FU\_END\_AGE.

Other case when this can happen is if an individual has moved abroad (in this case FU\_END\_AGE is age at emigration), but moved back later and gave a sample to biobank. In this case BL\_AGE is after the FU\_END\_AGE and difference can be several years.

Take a look also at the section [Complete follow-up time of the FinnGen registries – primary endpoint data](/finngen-data-specifics/endpoints/complete-follow-up-time-of-the-finngen-registries-primary-endpoint-data.md)