An old-timer is someone who has been part of a place, activity, or organization for a very long time. When a teacher has worked at the same school for thirty years, other teachers might call her an old-timer. In a neighborhood, the old-timers are the families who remember what the streets looked like before new buildings went up, back when there was a vacant lot where kids used to play baseball.

The term carries a sense of respect and experience. Old-timers have seen how things change over time. They know the history, the traditions, and often the best ways to do things because they've learned through years of practice. A baseball old-timer might remember watching games at stadiums that don't exist anymore. A factory old-timer knows tricks for fixing machines that newer workers haven't learned yet.

People sometimes use old-timer affectionately, even teasingly, when talking to or about someone who's been around a long while. A grandfather might jokingly call himself an old-timer when his grandchildren ask about life before smartphones. The word suggests not just age, but experience and continuity: being a living connection to the past.