As noted above neither your FAA or EASA license expire, however to use the flying privileges of either you must:
FAA: do a Biennial Flight Review which is once every two years (not biannual) which consists of 1hr flying and 1hr ground with FAA Instructor
EASA: revalidate (or renew) your relevant helicopter ratings. See here:
https://www.easa.europa.eu/document-...orsement-lists