How to Say "senior member" in Spanish
The Spanish word for “senior member” is “decano” — C1 level.
English → SpanishC1
nounC1formal
the person who has been in a group the longest

Examples
Es el decano de los periodistas deportivos en el país.
He is the senior member of the sports journalists in the country.
Seniority vs. Age
This word focuses on how long someone has been doing a job, not necessarily how old they are.
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