Peasch 5786 - "הרי אני כבן שבעים שנה"

This Wednesday night, we partake in the most unique night of the year, ליל הסדר. There, we read the הגדה, highlighted by מגיד. In רבי אלעזר בן עזריה ,מגיד states: “הרי אני כבן שבעים שנה ולא זכיתי שתאמר יציאת מצרים בלילות עד שדרשה בן זומא - I am like a 70 year old, and I haven’t merited to prove that one must speak the exodus from Egypt at night until I heard the Drasha of Ben Zuma.” This statement is very confusing. Why does he say that he is only ‘like’ a 70-year-old? What is the relevance of this proclamation to recounting the Exodus at night? And if it’s just referring to his age and wisdom, how then can we understand such a צדיק boasting about himself?Recorded in Yerushalayim