longstanding

Anything longstanding has been around for a long time. If it's a longstanding tradition for your school's senior class to play a prank, that means it was even going on back when your grandfather's class let hundreds of crickets loose in the halls.

Humans keeping cats as pets is a longstanding custom, and the habit of cooking food before eating it is also longstanding. You can call yourself a longstanding customer of your town's last remaining video store if you've been going there for years, or a longstanding fan of your favorite tennis player if you've followed her entire career. The adjective longstanding has been around since the early 1800s, so it's longstanding too.

Definitions of longstanding
  1. adjective
    having existed for a long time
    “a longstanding friendship”
    “the longstanding conflict”
    Synonyms:
    long
    primarily temporal sense; being or indicating a relatively great or greater than average duration or passage of time or a duration as specified
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