The older coworker who shows you the ropes is giving you something nobody pays them for. Say thank you.

Training a new person is unpaid work that happens anyway. Somebody slows down their own shift to show you where things are and which rules are real, and no part of their wage reflects it. Mostly they do it because somebody did it for them. That chain continues only if the people in it feel it was worth doing.

Thank the specific person, specifically, for the specific thing they taught you. It takes one sentence and almost nobody ever says it. Then, when a newer person shows up, do the same for them without being asked.