Rashi on Exodus 3:16/רש"י על שמות ג׳:ט״ז

1את זקני ישראל THE ELDERS OF ISRAEL, those singled out to attend meetings, (i. e. the leaders) (cf. Yoma 28b). If, however, you should say that the text means old men in the ordinary sense I ask: How was it possible for him to gather all the old men amongst a male population of 600,000?