It finished 50-14.
Ireland had to settle for runners-up spot at the World Under-20 Championship.
They lost 50-points to 14 to France in Cape Town this evening.
France ran in seven tries to win the competition for the third time in a row.
Four Kildare players were involved in the matchday squad - Suncroft's Cian Prendergast, Sallins' Diarmuid Mangan, Naas' Andrew Osborne and Naas RFC's Oscar Cawley.
South Africa finished the tournament with the bronze medal via a 22-15 win over England.