Some players have age 0 when playing on birthday

[peteowen1]

Please briefly describe your problem and what output you expect.

Please include a minimal reproducible example (AKA a reprex). If you've never heard of a reprex before, start by reading https://www.tidyverse.org/help/#reprex.

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Some players have age 0 when playing on birthday
(https://x.com/crow_data_sigh/status/1818171304551633093)

# insert reprex here

[peteowen1]

fixed by #241