Your first manager might be nineteen. Respect still matters at every age.

Authority and seniority come apart early in working life. The person telling you what to do may be a year older than you, in a job they also just learned, holding responsibility they did not ask for. How you treat them is not about whether they have earned your deference; it is about whether the shift runs well.

Make their job easier this week in one concrete way: show up early, flag a problem before it grows, do the task without being reminded twice. You will be in that chair someday. People remember who made the job harder.